Product details WaveCel advanced helmet technology Intuitive, one-handed Headmaster II fit system makes height and circumference adjustments easy LockDown dividers make helmet strap management clean and easy to adjust Soft, comfortable and moisture-wicking washable helmet pads The ...Product details WaveCel advanced helmet technology Intuitive, one-handed Headmaster II fit system makes height and circumference adjustments easy 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 The 30-Day Unconditional Guarantee allows you to return your helmet if you're unsatisfied for any reason The Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership A major advancement in the protection against cycling-related head injuries The Starvos WaveCel is a versatile, high-value cycling helmet for new and seasoned riders alike who want 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 Trek-exclusive technology disrupts the safety standards that the industry has accepted for over 30 years.