Aerodynamic lines and engineered ventilation specialize the Tifosi Crit Glasses for endurance sports. The adjustable arm and nose pieces allow you to specialize the Crit for your personal comfort. The Crit is made of Grilamid TR-90, a homopolyamide nylon characterized by an extremely high alternative bending strength, low density, and high resistance to chemical and UV damage. If you're looking for high performance cycling glasses, the Crit is for you!