The Cressi Bolt Swim Goggles were created for Competition Swimming Use. The Special Polycarbonate Shatterproof Lenses have an External Scratch-Proof and UV Protective Treatment for Strength, Durability and Protection from the Sun's Harmful Rays. The Bolt Goggles have an Anti-Fog Treatment for Clear and Crisp Vision Indoors-or-Out. The Goggles have No-Waterproof Seals, because their Special Shape is designed to fit right into the Eye Socket. The Minimum Overhang of the Lenses guarantees Excellent Visibility and Minimum Resistance with the Water for Low Drag so as to favor High-Speed Performance. The Bolt Goggles have a Double Latex Head Strap, Plastic Nosepiece Eyelets with a Small Latex Line for attachment. Goggles are covered by a 12 month limited warranty.