DESIGN & TECHNOLOGY: Perfect for competitive or performance swimming Curved lens for excellent peripheral vision and clarity Mirrored coating blocks UV rays and reduces glare Curved back clip for a comfortable fit against your head Ergonomic nose bridge fits a variety of face shapes Nike(R) Swift Track nose bridge for quick, easy customization Includes four (4) nose bridge sizes for convenience SPECS: Lens: Polycarbonate Gasket: Silicone Strap: Silicone