The Chameleon mountains sports sunglasses are perfect for extreme activities. Designed to suit tough conditions with a removable wind gasket and interchangeable arms to transform the frames to an all about town piece. Category 4 lenses provide a darkened tint to give comfort where light may be at its brightest such as up high in the mountains or at sea. The distortion free, impact resistant XTR Karbon8 optical class one lenses provide maximum protection against UVA, UVB and other harmful blue light up to 400nm.  Features: High mountain extreme conditions specific eyewear Category 4 lens for maximum protection Removable wind gasket and interchangeable arms to straight or malleable hooked rubber.