We designed these shades to look good & fit comfortably on your face when your gluteus maximus is doing all the work. NO SLIP. NO BOUNCE. ALL POLARIZED. ALL FUN.™&650 1 NO SLIP We use special grip coating to construct our frame to help eliminate slippage when sweating. 2 NO BOUNCE Our frame is snug & light-weight with a comfortable fit to prevent bouncing while. 3 ALL POLARIZED Glare-reducing polarized lenses & UV400 protection that blocks 100% of those harmful UVA & UVB rays. 4 NO LEOPARDS Plus no one wearing goodr sunglasses has ever been attacked by a leopard (as far as we know).