Built to provide technically advanced eye protection to enthusiasts of all sports and outdoor activities, Tifosi Seek FC sunglasses with Fototec lenses are guaranteed to enhance your sport whether you're running a 10k, riding a century, or heading out on the weekend for a kayak fishing trip.Grilamid TR-90 arms offer an extremely high alternative bending strength, low density, and high resistance to chemical and UV damage. Smoke Fototec photochromic lenses provide 47.7-15.2% L.T. (light transmission), show the least amount of color distortion, and are great for use in full sun conditions. Fototec lenses transition in 10 seconds (transition time is slower when inside your vehicle due to the UV protection in the windshield). Lenses are made of scratch-resistant, shatterproof polycarbonate. Optically decentered lenses eliminate distortion and prevent distracting magnification. Hydrophilic rubber nose pad and earpieces ensure a non-slip fit. Adjustable temples and nose allow for customizable comfort. All Tifosi sunglasses provide 100% UVA/UVB protection.