Zoggs Predator Flex Reactor S/M Swim Goggle EXTREMELY COMFORTABLE: Super soft medical grade silicone is unique to our goggles. Allows for an extremely comfortable and super soft fit around the eyes for a more pleasing swim. REACTOR PHOTOCHROMATIC LENSES: Provide the perfect lens tint for ALL swimming conditions. Lenses automatically adjust from light to dark tint and back quickly to protect eyes from the sun and fatigue. PATENTED NOSEBRIDGE: Our Unique, Exclusive, one of kind nose bridge is engineered and built to always retain it's shape and will not spread when the head straps are tightened. BEST ANTI FOG TREATMENT IN THE INDUSTRY: Instead of a film like other swim companies, our anti fog is part of the material of the lenses. DOUBLE HEADSTRAP: Split Head strap wraps around both the top and lower part of the backof the head, offering more security so that you don't lose your goggles when swimming.