PERFORMANCE TECHNOLOGIES: Aero(TM) is reinforced with an innovative shock absorbing material from D3O(R) , designed to reduce transfer of force on impact. Our FIT-SENSE(TM) sizing system features an easy-to-adjust click strap that creates a comfortable and secure fit on the field. Make your lid your own with the large customizable CNVS(TM) zones, which provide more space than any other helmet on the market for decals.