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Helmets

$549.00
The Bluegrass Legit Carbon Helmet is a premium race-day full-face helmet. Developed for competitions, it exceeds all of the certifications for racing downhill and enduro. - The Legit Carbon features a flexible safety-release visor to avoid twisting of the neck in impacts from any angle. - Designed with hearing vents to help riders maintain balance and hit their optimum performance levels - The Legit Carbon uses a carbon fiber outer shell paired with a multi-impact EPS liner to achieve the finest blend of high-impact performance and low-weight - Vents and air channeling are optimized for all-day park sessions, with two large exhausts working in synergy with the EPS channels, to keep you cool at both high and low speeds - Featuring the MIPS E5-4® brain protection system, the BLUEGRASS Legit Carbon is able to slide relative to the head in the case of a crash, redirecting damaging rotational motion - The Legit Carbon is suitable for all head shapes and sizes, thanks to its meticulously refined internal shaping - The comfort is boosted even more by the snap-in soft padding - Durability and quality are enhanced by an injected PU foam paired with the chin guard and three polycarbonate shells strategically molded on the EPS liner
$11.95
This helmet mount works with all CatEye Lights. Pair it with the Volt 800 for the ultimate trail solution.
$65.00
You need to get out on your bike even in terrible weather. Fitting in an early commute or a mid-winter ride is easier when you're warm, comfortable, and visible. Keeping your head warm in bad weather can be the best way to fend off the elements. - GORE-TEX Product: durably waterproof, windproof and extremely breathable - Reflective band - Elastic hem - Reflective logo - Durably waterproof - Extremely breathable - All weather conditions - Engineered for Cycling - Weight: 0.8 ounces
$50.00
- In-molded construction - TransTextura moisture-wicking, anti-odor inner padding - MIPS Protection Sizing: - Small/Medium = 49 – 57cm - Medium/Large = 53 – 61cm
$55.00
- In-molded construction - TransTextura moisture-wicking, anti-odor inner padding - MIPS Protection - Optional visor on Path MTB helmet Sizing: - Small/Medium = 49 – 57cm - Medium/Large = 53 – 61cm
$109.99
RISE ABOVE. With cutting-edge design and maximum ventilation, Rev is one of the official helmets of Team Giant-Sunweb. From hors categorie climbs to World Cup cyclocross racing, it’s the ultimate choice for superior fit, comfort and protection. FEATURES - 21-vent configuration for optimal airflow and top-of-the-head ventilation - LiteForm webbing for enhanced comfort and performance - Internal Structural Shell (ISS) for strength at a reduced weight - Giant CINCH+ fit system for simple and easy head-hugging comfort - Proprietary TransTextura PLUS anti-microbial fast-wicking pad technology - MIPS is a low friction layer between the head and the helmet that provides added protection with respect to angled impacts SPECIFICATIONS - Western: S (51-55cm);M (55-59cm);L (59-63cm) - Weight: 280g (size M, CPSC/CE) - Certifications: CPSC/CE;AS/NZS
$109.99
TACKLE ALL TRAILS With a new head form that provides a better fit for more riders, the redesigned Roost features trusted Mips protection, a precise three-position rear-height adjustable fit system, increased ventilation, and modern styling. Certified five-star by the world-renowned Virginia Tech Helmet Safety Lab, Roost is a lightweight go-to helmet for charging the toughest trails. FEATURES - An all-new, rounder head form offers a more universal fit - Mips rotational impact protection system - In-molded upper and lower PC shells for an optimal protective structure at a light weight - Optimized low and high EPS density - Five-star safety rating from the Virginia Tech Helmet Safety Lab - Easily accessible dual-arm, snap-on, three-position rear height adjustment - 12 oversized vents for maximum head-cooling airflow - Supple and lightweight strap system - Three-position adjustable visor SPECIFICATIONS - Sizes: S (51-55cm) M (55-59cm) L (59-63cm) - Weight: 385g (Size M) HIGHLIGHTS Featuring the trusted lightweight Mips rotational impact liner, in-molded upper and lower PC shells, and a redesigned three-position rear-height fit system, the new Roost combines trusted protection with cool comfort and looks. ROUNDER HEAD FORM DESIGN A new rounder head form gives the Roost a more universal fit, allowing more riders to find the perfect size. TRUSTED MIPS PROTECTION An industry standard for more than 15 years, the Mips rotational impact liner manages the forces of rotational motion, separating the shell and liner with a low-friction layer that slides relative to the head on angled impact. EASY HEIGHT ADJUSTMENT A dual-arm, snap-in, three-position rear height adjustment allows you to dial in the perfect fit. TWO-LAYER PROTECTION In-molded upper and lower PC shells provide optimal protective structure at a super lightweight. OPTIMAL AIRFLOW 12 oversized vents keep you cool on the hottest days. MIPS: The Mips BPS (Brain Protection System) is designed to add protection in helmets against the rotational motion. The rotational motion is a combination of rotational energy (angular velocity) and rotational forces (from angular acceleration) that both affects the brain and increases the risk for minor and severe brain injuries. Mips BPS has been scientifically proven to reduce rotational motion when implemented in a helmet by absorbing and redirecting rotational energies and forces transferred to the brain. VIRGINIA TECH 5 STAR RATING In collaboration with the Insurance Institute for Highway Safety, Virginia Tech have rated a total of 128 bike helmets using the STAR evaluation system. The bicycle helmet impact tests evaluate a helmet's ability to reduce linear acceleration and rotational velocity of the head resulting from a range of impacts a cyclist might experience. Helmets with more stars provide a reduction in concussion risk for these impacts compared to helmets with less stars.
$189.99
CONQUER WITH CONFIDENCE Created with an all-new head form for a more universal fit and the super-slim Mips Air Node® integrated rotational impact protection system, the third-generation Rail is our most comfortable and lightweight trail helmet yet. Boasting a five-star safety rating from the world-renowned Virginia Tech Helmet Safety lab, the Rail also features an accessible, four-position, snap-in height adjustment system, increased ventilation, and supple, lightweight straps with a handy Fidlock® buckle. Comfort, confidence, and zero distractions—so you can focus on charging descents while staying cool on tough climbs. FEATURES: - Designed with a new, rounder head form for a more universal fit - Fully integrated, super-slim Mips Air Node® liner combines maximum rotational impact protection with ultra-lightweight comfort - In-molded upper, sub, and lower PC shells for optimal protective structure - Optimized low and high EPS density - Five-star safety rating from the Virginia Tech Helmet Safety Lab. - Easy to adjust, dual-arm, four-position, snap-in rear height adjustment fit system - 21 strategically placed vents for head-cooling airflow - Supple and lightweight straps with magnetic Fidlock® buckle system - Three-position adjustable visor - Broad top surface area for camera or light attachments SPECIFICATIONS: - Sizes: S (51-55cm) M (55-59cm) L (59-63cm) - Weight: 360g (Size M)
$263.00
Integrated for speed. Pursuit combines the aero speed of a TT helmet with the head-cooling ventilation of a pro road racing helmet. Tested and proven by Team Sunweb riders like Michael Matthews, who wore it to win the 2017 Tour de France points classification, Pursuit brings together innovative technologies to optimize aerodynamics, ventilation and comfort, all in one helmet. FEATURES - Optimized ventilated aerodynamics design - Design minimizes drag, producing maximum speed in real-world rider positions - Strategically placed AeroVent ports optimize airflow through the helmet, which improves aerodynamics and adds head-cooling ventilation - AeroVent ports pull incoming air through the helmet and streams it through deep internal channels to regulate temperatures during hard efforts - TransTextura Plus anti-microbial padding helps fight bacteria growth and the natural property of the fabric inhibits microbes that cause odors - Low and high-speed impact-tuned construction with optimized low-density EPS, and an ultra-thin toughened polycarbonate shell - Element Strap System (ESS) brings together Cinch Pro, adjustable locking dividers, and LiteForm webbing into one fit and retention system for superior fit and comfort right out of the box - Integrated MIPS Cinch Pro fit system offers optimal coverage by cradling the occipital bone for full protection, support and comfort - Lightweight, LiteForm webbing wraps around the head better for a more secure fit and is hydrophobic so it won’t absorb sweat or stretch out like other webbing SPECIFICATIONS - Sizes: Western: S (51-55cm), M (55-59cm), L (59-63cm) - Weight: 230g (size M, CPSC) - Certifications: CPSC/CE, AS/NZS
$7.99
Don't underestimate the power of new pads! The Register Helmet Pad Kit replaces your worn-out pads by improving the comfort, fit, and stability of your helmet while wicking away moisture.
$60.00 - $70.00
The Scamp MIPS is packed with amazing features, including some of the same elements found in Giro's best adult helmets, all in a smaller package designed to fit your child. The Roc Loc Jr. fit system with pinch-guard buckle provides an easy way to fit your kid’s helmet quickly and securely. The wide size range ensures children can use this helmet as they grow from balance bikes to training wheels. The design is inspired by the adult Montaro MIPS / Montara MIPS, and since the Scamp MIPS is available in a range of kid-friendly colors and designs, children will be excited to wear it every time they ride. Scamp MIPS models are available with the Multi-Directional Impact Protection System. MIPS can redirect energy and provide more protection in certain impacts.
$70.00
The Register MIPS helmet combines sleek design and lightweight construction to match your style, on the road or trail. Made in a comfortable Universal Fit size with Giro's convenient Roc Loc Sport fit system, the Register MIPS adjusts with a simple turn of the dial so you can tune the fit in seconds. A range of colors lets you choose exactly how your on-bike style comes together. Register MIPS models also have an integrated Multi-Directional Impact Protection System, which can redirect energy and provide more protection in certain impacts.
$70.00
The Trella MIPS offers a comfortable fit, with deep coverage and open ventilation in a design that is suitable for nearly any ride. It’s built using In-Mold construction to reduce weight while enhancing durability that stands up to everyday use. The ease and comfort of Giro's acclaimed Roc Loc Sport MIPS fit system makes fitting as easy as turning a dial, and the fit system is seamlessly integrated with the Multi-Directional Impact Protection System (MIPS), which can redirect energy and provide more protection in certain impacts. When you put it all together, you get the versatility you need to ride everything from forested fire-roads to swooping singletrack trails to the city streets. - Universal One Size
$70.00
When every curb is a jump and every patch of dirt screams for a skid, the Tremor MIPS is there to keep smiles wide. Featuring some of the best technologies from Giro's adult line, like In-Mold construction for reduced weight and enhanced durability, and their acclaimed Roc Loc Sport system for fast, secure fit adjustments, the Tremor is ready for any ride. Tremor MIPS models also include an integrated Multi-Directional Impact Protection System (MIPS), which can redirect energy and provide more protection in certain impacts, providing the latest in head protection technology for junior riders.
$70.00
The Tremor MIPS helmet's cool style is more than meets the eye. It features the latest in head protection technology, an easy-to-adjust fit system, and 18 vents for breathability, making it a big hit with parents and little shredders alike. Featuring some of the best technologies from our adult line, like In-Mold construction for reduced weight and enhanced durability, and our acclaimed Roc Loc Sport system for fast, secure fit adjustments, ensure that the Tremor is ready for any ride. The Tremor MIPS also includes an integrated Multi-Directional Impact Protection System (MIPS), which can redirect energy and provide more protection in certain impacts, providing the latest in head protection technology for junior riders. MIPS: - Integrated MIPS (Multi-Directional Impact Protection System)—allows you to customize fit/feel for great stability and long-range comfort while providing an added measure of protection from rotational forces in the event of an angled impact Construction: - In-Mold construction - Full Hardbody shell Shell Type: - Polycarbonate shell - Number of vents: 18 Sport: - Cycling Visor: - Removable visor Interior/Liner Type: - Quick-dry padding Fit system: - Roc Loc Sport MIPS Impact Liner Type: - EPS
$70.00
The Vasona MIPS helmet combines sleek, lightweight design with an integrated Multi-Directional Impact Protection System (MIPS) that can redirect energy and provide more protection in certain impacts, giving you the latest in head protection on the road or trail. Made in a comfortable, Universal Fit women's size with Giro's adjustable Roc Loc Sport fit system, the Vasona's fit can be custom-tuned with a simple turn of the dial to make fitting fast and hassle-free. And with a range of colors to suit almost any style, you can choose exactly how your on-bike style comes together.
$95.00 - $100.00
The Radix MIPS helmet combines rugged style and durability to meet the demands of core trail riders, with the coverage, lightweight, and ventilation riders need to ride comfortably and confidently, all day. The Radix MIPS helmet is for the rugged adventurer who appreciates a perfect fit, the sun staying out of their eyes, and plenty of ventilation. The highly adjustable Roc Loc 5.5 MIPS system allows you to customize fit and feel for enhanced stability and long-range comfort while providing an added measure of protection from rotational forces in the event of an angled impact. The P.O.V. Visor offers 15 degrees of adjustment, and the tough polycarbonate outer shell is fused permanently to the EPS foam liner using our in-mold construction process, to enhance durability and ventilation without excess bulk. - Construction: Full-wrap in-mold polycarbonate shell with EPS liner - Sport: Cycling - Number of vents: 25 - Ventilation type: Wind tunnel vents with internal channeling - Fit system: Roc Loc 5.5 MIPS
$99.99
Freezing air and falling snow won’t keep you stuck inside. Whether commuting year-round or riding powdery backwoods singletrack, the Timberwolf is the helmet for your coldest rides. The Timberwolf leverages Giro’s industry-leading snow-helmet design to keep you warm and comfortable in spite of winter’s chill. This light, low-profile helmet is loaded with features, including Stack Vent technology to help reduce goggle fogging, an In Form fit system (for easy adjustment with gloved hands), plus on-the-fly adjustable Thermostat Control ventilation. And with a brushed fleece liner and removable ear pads, you’ll be comfortably covered for any winter adventure.
$100.00
When it's time to hit the road, the Agilis MIPS offers a sporty, sleek style with comfortable features you can count on, including 32 wind tunnel vents, Coolfit anti-microbial padding, and integrated MIPS technology. The fit on the Agilis MIPS is comfortable and secure thanks to our adjustable Roc Loc 5.5 MIPS system that combines fit and positioning adjustments while integrating with MIPS technology for an added measure of protection in the event of an angled impact. The outer Hardbody shell extends to the inside of the helmet, and is molded from a tough polycarbonate thats fused permanently to the EPS foam liner using our In-Mold process to enhance durability and ventilation without excess bulk. - 32 Wind tunnel vents with internal channeling - Full-wrap in-mold polycarbonate shell with EPS liner - Coolfit anti-microbial padding - Featherweight webbing with Slimline buckle - Roc Loc 5.5 MIPS fit system
$100.00
The Agilis W MIPS offers assured style and performance for women, with a sleek silhouette, airy design, and MIPS technology. The Agilis MIPS W is the right choice for women looking for a helmet that combines airy design with slightly deeper coverage and a host of performance features aimed at road and multi-surface riding. The fit is comfortable and secure thanks to our adjustable Roc Loc 5.5 MIPS system that combines fit and positioning adjustments while integrating with MIPS technology for an added measure of protection in the event of an angled impact. The outer Hardbody shell extends to the inside of the helmet, and is molded from a tough polycarbonate that's fused permanently to the EPS foam liner using our In-Mold process to enhance durability and ventilation without excess bulk. The fit is comfortable and secure thanks to our adjustable Roc Loc 5.5 MIPS system that combines fit and positioning adjustments while integrating with MIPS technology for an added measure of protection in the event of an angled impact. The outer Hardbody shell extends to the inside of the helmet, and is molded from a tough polycarbonate that's fused permanently to the EPS foam liner using our In-Mold process to enhance durability and ventilation without excess bulk. Specs: - Impact Management: Integrated MIPS - Construction: In-mold construction, Four-piece Polycarbonate Interlocking Hardbody Shell, Full Hardbody Wrap - Ventilation:Wind tunnel vents with internal channeling - Fit System: Roc Loc 5.5 MIPS - Weight: 300g (Size Medium CPSC); 280g (Size Medium CE) - Certification: Complies with the US CPSC Safety Standard for bicycle helmet for persons age 5 and older E.U.: CE EN1078
$100.00
The Radix MIPS W helmet combines rugged style and durability to meet the demands of core trail riders, with the coverage, light weight, and ventilation riders need to ride comfortably and confidently all day. The Women's Radix MIPS W helmet is for the rugged adventurer who appreciates a perfect fit, the sun staying out of their eyes, and plenty of ventilation. The highly adjustable Roc Loc 5.5 MIPS system allows you to customize fit and feel for enhanced stability and long-range comfort while providing an added measure of protection from rotational forces in the event of an angled impact. The P.O.V. visor offers 15 degrees of adjustment, and the tough polycarbonate outer shell is fused permanently to the EPS foam liner using our In-Mold construction process, to enhance durability and ventilation without excess bulk. Specs: - Integrated MIPS - Construction: In-mold polycarbonate shell with EPS liner - Ventilation: Wind tunnel vents with internal channeling - Fit System: Roc Loc 5.5 MIPS - Weight: 316g (Size Medium CPSC); 300g (Size Medium CE) - Certification: Complies with the US CPSC Safety Standard for bicycle helmet for persons age 5 and older, E.U.: CE EN1078 - Highlights: P.O.V. Adjustable visor, Quick dry padding, Slimline webbing
$130.00
The Source MIPS helmet combines advanced performance and protection in a rugged, trail-ready design. Featuring deep coverage with aggressive ventilation from 16 vents coupled with deep internal channeling, it helps keep things cool even when the riding gets rowdy. And with the comfort and secure feel of the Roc Loc 5 fit system with Integrated MIPS brain protection, plus a moto-style adjustable screw-in visor and full lower Hardbody durability, you get a helmet that's capably equipped for fun and adventure. MIPS: - Integrated MIPS (Multi-Directional Impact Protection System)—allows you to customize fit/feel for great stability and long-range comfort while providing an added measure of protection from rotational forces in the event of an angled impact Construction: - In-Mold polycarbonate shell and EPS liner - Polycarbonate Hardbody lower shell Visor: - Adjustable moto-style screw-in visor Interior/liner type: - Coolfit anti-microbial padding Ventilation type: - 16 Wind Tunnel Vents with internal channeling Fit system: - Roc Loc 5 Impact liner type: - EPS foam liner Product weight: - 340g (size Medium)
$149.99 - $160.00
The Giro Cinder MIPS provides all the features an avid road rider wants in a lightweight package. The design is inspired by the classic aesthetic of their premium Synthe helmet, offering similar performance and style. Key features include the Roc Loc 5 fit system, which allows you to easily dial in fit tension and adjust vertical position with a single hand. Air-FX padding offers comfort on your longest rides, and the helmet is equipped with MIPS to redirect impact energy, providing more protection in certain impacts.
$160.00
An updated classic. Already one of our most popular trail helmets of all time, the Montaro MIPS II now benefits from the Roc Loc 5 Air MIPS System. This sleek design integrates 2-way fit and stability adjustment with the MIPS brain protection system for an added measure of protection from rotational forces without excess plastic against your skin. The helmet's compact shape offers deep coverage and an in-mold hardbody shell for enhanced durability without excess weight. In addition to advanced brain protection, the Montaro II is outfitted with IONIC+ padding with permanent antimicrobial performance plus 16 vents with internal channeling to keep you cool and comfortable. We also built in all of the features you need for great fit with goggles, including strap grippers on the back of the helmet and our patented P.O.V. Plus visor that allows you to lift the visor and place your goggles on the front of the helmet when your run is done. A clever breakaway interface for your favorite light or camera is included, too.
$200.00
The Kali Grit Helmet is designed for performance road cycling. It features a Rheon Low-Density Layer (LDL) to protect you in the case of low-G linear or rotational impacts, and Kali's proprietary Supervents to increase overall strength and help with ventilation. The Grit also features the Frequency Fit System, with vertical adjust and dial retention, Fixed Strap Intersections, Unibody Construction and a Rollcage Internal PC Bridge, for added strength. - Rheon Low-Density Layer (LDL) reduces rotational impact forces up to 25% and reduces low-g linear forces up to 30% - Supervent: injection molded skeletal structure for added strength and larger volume intake vents - Frequency Fit System, with dial and vertical adjust offers three positions for maximum comfort and fit - Fixed Strap Intersections: Stops the straps from twisting, while keeping them flush against your face - Unibody Construction: Couples the upper and lower shells for a dialed fit and finish, while adding strength - Rollcage Internal PC Bridge: Used to increases the overall strength of the helmet
$50.00
- In-molded construction - TransTextura moisture-wicking, anti-odor inner padding - MIPS Protection - Optional visor
$55.00
Inspired by gravity riders and presenting a modern mountain biking style, this off-road helmet is designed with generous ventilation and added protection Along with essential safety features like MIPS technology, we’ve added a lower rear coverage design to shield more of the back of your head. Direct Flow Cooling channels are designed to pull in air to keep you cool during slow, challenging climbs or flowy descents. With a one-handed dial adjustment and rear fit system you get perfect head-hugging comfort. - Simple, clean and compact helmet shape - Optimized vent design for enhanced breathability - MIPS brain protection system and lower rear coverage - New 360° full surround fit-belt - Intuitive one-handed dial adjustment (Cinch ONE fit system) - Compatible with Alumbra taillight: Liv proprietary taillight docking station - In-molded construction for added strength - TransTextura moisture-wicking, anti-odor inner padding - Pony-tail friendly rear fit system space - Detachable visor - S / M (49-57cm), M / L (53-61 cm)
$100.00
With authentic off-road style and a comfortable fit, this helmet deLivers it all for aspiring adventurers. Integrated features including a camera mount and compatibility with the Giant Numen Link taillight make it easy to customize your ride. - We've got you covered! 1 year crash replacement program. - Trail specific design. Purpose built for aggressive trail and enduro riding. Rail features a new shape with extended rear coverage. - A total of 18 vents with straight, non tapered walls, designed and positioned for off-road performance. The size and shape of the vents helps guide airflow through interior channels to maximize ventilation at low and high speeds for better cooling - Cinch Pro Fit system. - Integrated magnetic mount for the Numen+ Link and Recon TL - MIPS mimics the brain's own protection system by adding a low friction layer between the head and the helmet reducing rotational violence that causes strain to the brain at angled impacts
$109.99
The all-new Liv Rail Mips Helmet features the latest in high-performance off-road technology. Purpose-built with extended bottom shell design for additional back-of-head coverage plus the Integrated Mips Air Node technology to offer the best rotational impact protection. The 4-position rear height adjustment provides an optimal secure fit every time, sweat-blocking brow pads and an anti-microbial strap bring comfort even when things heat up. The ultimate helmet for riders who demand the perfect combination of comfort, fit, and increased protection. MIPS® The Mips® BPS (Brain Protection System) is designed to add protection in helmets against the rotational motion. The rotational motion is a combination of rotational energy (angular velocity) and rotational forces (from angular acceleration) that both affects the brain and increases the risk for minor and severe brain injuries. Mips® BPS has been scientifically proven to reduce rotational motion when implemented in a helmet by absorbing and redirecting rotational energies and forces transferred to the brain. SPECIFICATIONS: - Western sizes - Small: (51-55cm) - Medium: (55-59cm)
$189.99
The all-new Liv Rail Mips Helmet features the latest in high-performance off-road technology. Purpose-built with extended bottom shell design for additional back-of-head coverage plus the Integrated Mips Air Node technology to offer the best rotational impact protection. The 4-position rear height adjustment provides an optimal secure fit every time, sweat-blocking brow pads and an anti-microbial strap bring comfort even when things heat up. The ultimate helmet for riders who demand the perfect combination of comfort, fit, and increased protection. FEATURES: - Created with an all-new, rounder head form for increased fit range - Fully integrated, super-slim Mips Air Node liner combines maximum rotational impact protection with ultra-lightweight comfort - In-molded upper, sub and lower PC shells for optimal protective structure - Optimized low and high EPS density - Five-star safety rating from the Virginia Tech Helmet Safety Lab - Easy to adjust, dual-arm, four-position, snap-in rear height adjustment fit system for more precise fit options - Twenty strategically placed vents for optimal head-cooling airflow - Supple and lightweight straps with Magnetic Fidlock® buckle system - Broad top surface area for camera or light attachments SPECIFICATIONS: - Western sizes - Small: (51-55cm) - Medium: (55-59cm) MIPS AIR NODE™ Mips Air Node™ is a super light and slim helmet security system that moves 10-15 mm in relation to the helmet’s energy-absorbing layer, reducing the rotational forces that are otherwise transmitted to the brain during impact. Fully integrated into the helmet’s padding, Mips Air Node™ is as light as possible and designed to fit each individual helmet model and size, making it virtually invisible until needed. MAGNETIC FIDLOCK® Magnetic Fidlock® helmet buckles are intuitive, pinch-free, and can be opened or closed with one hand, even while wearing gloves. VIRGINIA TECH 5 STAR RATING In collaboration with the Insurance Institute for Highway Safety, Virginia Tech have rated a total of 128 bike helmets using the STAR evaluation system. The bicycle helmet impact tests evaluate a helmet's ability to reduce linear acceleration and rotational velocity of the head resulting from a range of impacts a cyclist might experience. Helmets with more stars provide a reduction in concussion risk for these impacts compared to helmets with less stars.