The Bontrager Rally WaveCel MTB Helmet is a high-style, high-value off-road helmet with trail-specific features and WaveCel, a leading technology in the protection against cycling-related head injuries. WaveCel is a collapsible cellular structure that lines the inside of the helmet. This Bontrager-exclusive technology disrupts the safety standards that the industry has accepted for over 30 years. Bontrager Rally WaveCel MTB Helmet  WaveCel advanced helmet technology Virginia Tech 5-STAR rating BOA® Fit System lets you easily secure and adjust your helmet fit with one hand Adjustable visor offers multiple coverage options Extended back-of-helmet shell offers additional rear protection LockDown dividers make helmet strap management clean and easy to adjust Soft, comfortable and 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