The Head Vortex Swim Goggles have Silicone Gaskets for Added Comfort and Fit. The Easy Adjust Auto-Clip Strap System makes adjustment a snap. The Silicone Split-Yoke Head Strap increases the Sealing Ability of the Goggles to help Prevent-Leaks. Goggles have Durable Polycarbonate Lenses with Anti-Fog Treatment for Fog Free Swimming and to protect you from the Sun's Harmful Rays are complete with UV Protection. Exceptional Fit and Durability these Goggles are available in 2 Color Choices.