These Torrent polarized, photochromic sunglasses feature lenses that automatically adjust tint so you can keep performing without interruption. Fototec lenses automatically adjust tint according to light conditions lenses darken in bright light and lighten when theres less light. Polarized lenses reduce 99 of visible glare from water, snow, sand and pavement for increased visual acuity and decreased eye strain. Lightweight and virtually shatterproof, polycarbonate lenses are 20 times more impact resistant than glass and one-third the weight. Grilamid TR90 lightweight nylon frames offer a consistent fit and flexibility in all temperatures and are extremely impact resistant. Hydrophilic rubber nosepiece and temple ends become tackier when wet for reliable grip during exercise and hot weather. Fits small to medium faces.