The Yoni offers a flexible polyurethane frame designed for smaller faces, ideal for women and youngsters. Yoni frames have easy to change cylindrical lenses for optimal performance in varying light conditions. They also feature universal helmet compatibility with a silicone lined strap that grips well to headwear. The Yoni goggle is produced with high quality tough, flexible thermoplastics and multi layer Whipped Cream face foam that is hypoallergenic. The double lenses are scratch resistant; antifog treated and give 100% UVA/UVB/UVC protection.