FIT Durable, flexible, and lightweight TR90 frame Ultra-grip rubber nose and temple tips provide a secure fit that won't let go 5.5-base cylindrical shield lens for increased peripheral view and protection Lower air scoops Increase comfortability and ventilation while reducing moisture collection on lenses DESIGN High-impact resistant and lightweight polycarbonate lenses let you wear these sunglasses in tough environments 360 degree visibility for unobstructed views and optimal field of vision Interchangeable scratch-resistant lenses provide 100% UV protection Keep water, dirt and oil at bay with HYDROILO lenses Also available with contrast-defining HiPER lens and photochromic options