ROKA F2 Anti-Fog Low-Drag Swim Goggles - Medium Sized Lens:44mm (W) x 33mm (H) premium grade polycarbonate lens Gaskets:Soft, protective & hypo-allergenic silicone gaskets; no latex, no PVC Lens Coating: Anti-fog coating Nose bridge:Integrated unibody flexible nose bridge; sits off frame to accommodate different nose shapes Strap: Flat silicone head strap with locking adjustment clip