AS SMART AS THEY ARE COOL. The Serengeti LUPTON men’s sunglasses with PhD™ 2.0 lenses are a game changer in eyewear. Built with environmentally-conscious nylon, the LUPTON are zero-waste nylon sunglasses that also feature soft temples and rubber on nose pads for comfortable, all-day wear. Putting on a pair of these is the smartest move you’ll make all summer. The Best Photochromic Polarized sun lenses for rimless frame. Photochromic lens perfectly adapting to only let the necessary light reach your eyes. Ideal for everyday use. Bio sourced Shape-memory material for a long lasting frame with a lower environmental impact.. The simplest hinge for ease of use. Lens Technology : PhD 2.0 Polarized Photochromic Spectral Control. Lens VLT : 22% to 9%. Lens Color : Smoke. Frame Material : Eco-Nylon. Hinge : Classic Hinges