The SINNER EMERALD ski goggles have a wide spherical lens with an extra-wide field of vision and an optimal fit. The category 3 lens has a special anti-fog coating and offers 100% UV protection. The soft hypo-allergenic foam fits well on any face and wears comfortably all day long. The SINNER EMERALD has an adjustable non-slip strap, making the goggles good to use with a ski helmet.