The 5.11 Burner Full Frame Sunglasses features a TPR (thermoplastic rubber) nose bridge insert to securely keep your sunglasses in place; no need to worry about them slipping off your face. OF course these sunglasses come with 100% UVA and UVB protections. The T-Shell coating on the 5.11 Tactical Burner Eye Wear make the lenses resistant to scratching, cracking and crazing. The lenses are distortion free and are GSA-compliant. The 5.11 Full Frame Sun Glasses are the only sunglasses you'll need for work and for your outdoor hobbies.