Zoggs 300848 Predator Flex L/XL - Mirrored Swim Goggles Silicone 100% silicone Mirrored lenses protect your eyes from the sun's glare Skeleton frame with silicone injected seals is light and flexes to your Face Nose bridge retains shape and will not spread when head strap is tightened Curved lens technology provides expanded 180 degree vision 4 Flexpoint Technology: Frame flexes in 4 key areas to conform to your face Mirrored Lenses: Protects your eyes and eliminates glare in open water swimming Curved lens technology provides expanded 180 degree vision Quick adjust: just pull the two straps to tighten and lift lever to loosen Anti-fog: lenses are coated with fogbuster anti-fog for clear vision