Goodr uses special grip coating to construct their frame to help eliminate slippage when sweating; The Goodr frame is snug and lightweight, with a comfortable fit to prevent bouncing while running; Goodr lenses offer UV400 protection that blocks 100% of those harmful UVA and UVB rays. They also feature glare - reducing, polarized lenses because you deserve the best; A reasonable price that won't bankrupt you if you happen to sit on them or leave them at a bar