Protects dog"s eyes from foreign objects, wind, and UV light * Made from rugged, high-quality materials, Doggles combine function and fashion. Protect dogs eyes while adding a sporty look to any canine. * Sizing Information: To determine proper back strap and frame length, measure the entire head circumference across the eyes and around under the ears. To determine proper chin strap length, start measurement just under one ear, go under the chin and back up to under the other ear. * Shatterproof (polycarbonate) & Anti Fog lens * Adjustable elastic head and chin straps