The Bontrager Rally Wave Cel mountain bike helmet in Olive Grey/ Roarangeis an off-road helmet with Wave Cel technology that balances comfort & performance for trail riders who value safety. Rally Wave Cel is a high-style, high-value off-road helmet with wave Cel & trail-specific features such as BOA® Fit System lets you easily secure & adjust your helmet to fit with one h&. Adjustable visor offers multiple coverage options. Extended back-of-helmet shell offers additional rear protection. Soft, comfortable & moisture-wicking washable helmet pads add convenience to functionality & safety. What is Wavecel? Standard foam-lined helmets are designed to reduce the impact to the skull & are tested by a drop impact. This does not take into account the movement the impact inflicts on the head, which often causes trauma to the brain. Wavecel not only protects from impact, but it also reduces the rotation of the head at the point of impact, therefore, decreasing trauma to the brain. This is done by creating a 3d mesh, the shape of which can absorb impact from any angle or movement. A standard foam helmet reduces the risk of concussion injury to 53% a Wavecel helmet reduces that further to 1.2%. This Bontrager-exclusive technology disrupts the safety standards that the industry has accepted for over 30 years. This helmet is greatthe level of protection Wavecel provides is worth the purchase alone add-in features like BOA® Fit System, adjustable visors & washable pad make the Rally perfect for mountain biking. Features Wave Cel advanced helmet technology Virginia Tech 5-STAR rating BOA® Fit System lets you easily secure & adjusts your helmet fit with one hand Adjustable visor offers multiple coverage options Extended back-of-helmet shell offers additional rear protection Lock Down dividers make helmet strap management clean & easy to adjust Soft, comfortable & moisture-wicking washable helmet pads The Crash Replacement guarantee provides a free helmet replacement if involved in a crash within the first year of ownership.