Protect your eyes and see better in different light conditions with the Walker Game Ear Sport glasses. These glasses have interchangeable lenses made from impact resistant polycarbonate. Feature: 4 Interchangeable Lenses High-grade Polycarbonate lenses for quick and easy replace. Exceeds ANSI 287.12003 high impact requirement 99 percent UVA/UVB protection Ratcheting lens pitch adjustment for custom fit and comfort Allows air to flow freely preventing lenses for fogging