The Swans Valkyrie MIT Mirror Goggles are a low profile, FINA approved competition goggle with new MIT technology which sandwiches the mirror between two polycarbonate layers to prevent scratches. This does not increase the thickness of the lens and it significantly improves the durability. FEATURES FINA Approved competition goggle with curved lens technology. MIT Mirror Insert Technology. Anti-scratch mirror lenses. PAF Premium Antifog. Proven to be 4 x more durable and 3 x more absorbent than regular anti-fog systems. RAD. Ready Adjust for quick and secure strap adjustments. Excess bulk behind the head is also reduced. 3D Asymmetrical gaskets for improved fit and comfort. 5 nose bridge sizes included helping achieve the perfect fit. 100% UV A and UV B protection. Includes free hard storage case.