HUUB Design Huub Aphotic Swim Goggle Photochromic Swim goggle that gets darker or lighter through photo chromatic technology. A self regulating lens that delivers the comfort and vision needed to maximize your sighting and assist your swim Photo chromatic clarity of vision aids sighting and allows you to move around obstacles and other swimmers even when you swim into the Sun, or with your back to the Sun Designed to fit the face perfectly with a Density of silicon and TPR matched to create a perfect fit and a feather like feel even on the most interesting of facial profiles