Fit & Design Modern wrap shield sunglasses Dark-to-light tint of the gradient lenses block overhead rays and increases ground visibility Special grip coating used to construct frame to help eliminate slippage when sweating Frame is snug and lightweight, with a comfortable fit to prevent bouncing while crushing any workout Glare-reducing, polarized lenses with UV400 protection that block 100% of those harmful UVA and UVB rays Additional Details Model: Astro G Medium frames made for medium noggins