The Brunton Echo Full Size Open Frame 10 x 42 mm Binocular is constructed with full image multi-coating technology and top of the line BaK-4 prism glass. The lightweight polymer body on the 10 x 42 mm binocular is waterproof, fogproof and armored for rugged use. Twist-up eye relief on this binocular ensures that you will be comfortable with or without your eyeglasses or sunglasses. The Echo Full Size Binocular 10 x 42 is constructed with an incredibly tough polymer with an ergonomic body armor that is virtually indestructible. Features: - Bak-4 Prism Glass - Full Multi-Coating - Waterproof - Nitrogen filled/fogproof - Polymer Frame with Ergonomic body armor - Tripod/ monopod compatible - Camo