If you're into Triathlon, open water, performance/training swimming then see better, and feel more comfortable when swimming with Zoggs Predator Mask Swimming Goggles. Bio-tech frame makes these goggles simply the most comfortable swim mask in the market, it uses liquid injected silicone technologyallowing it to easily flex to different facial structures. Goggles are designed for performance, with Curved Lens Technology (CLT). Lightweight Frame and Lenseswith 180 degree vision. Goggles offer UVA and UVB rays protection from the sun, and have Fogbuster impregnation for long lasting fog free swimming.