Trek Ballista MIP Black CPSCTrek's fastest, most aerodynamic helmet will save big watts and shave crucial seconds An excellent ventilation system makes this aero helmet surprisingly cool and comfortable The Mips Air system is light, cool and designed to improve comfort and protection The single lace BOA fit system is fully adjustable to provide a custom, 360 fit Rubberised sunglasses docking port provides secure and easy to use storage Bevelled front edge improves field of view