The Predator Flex Reactor goggle has been designed with Perfect Tint lenses, which quickly adjust the lens tint based on lighting conditions to protect eyes from the sun and fatigue. These photochromatic goggles are the perfect solution for all lighting conditons. The flexible frame provides a secure and comfortable fit and also creates a leak free seal around the eye. Curved Lens Technology allows a distortion free, full 180 degree field of vision. Reactor Photochromatic lenses automatically adjust to the perfect tint for all swimming conditions. 4 Flexpoint Technology: Frame flexes in 4 key areas including around the temple and across the nose bridge. Curved lens technology provides expanded 180 degree vision. Quick adjust strap mechanism can be adjusted in seconds by simply pulling the two straps to tighten and lift the lever to loosen. Lenses are coated with fogbuster anti fog for clear vision. LargeExtra larege frame fits average to slightly wider width faces. Silicone straps and seals for durability, flexibility and comfort.