Zoggs 315231 Vision Mask L/XL - Swim Mask Silicone Designed for smaller faces Soft silicone gasket molds to the Face Quick adjust: just pull the two back straps to tighten Comfortable and leak free Lenses are coated with anti fog for clear vision Soft silicone gasket molds to the face. Polycarbonate lenses. Anti-fog lenses. Clear vision. Quick adjustable silicone strap.