Streamlined lens shape for hydrodynamic performance with clarity Interchangeable nose bridges for an individual fit (S,M,L) Double silicone racing strap for a quick and secure fit Ergonomically curved back clip for flush fitting beneath cap, Blue tinted lenses for reduced glare in bright conditions - ideal for indoor & outdoor training Anti-fog coated lenses with 100% UV Protection against all harmful UVA & UVB radiation