NO SLIP- Lightly-textured silicone earpieces use the all new goodr Cat Tongue Technology to offer enhanced protection against slippage. NO BOUNCE - The frame is crafted to be feather-weight, yet snug, with a comfortable fit to prevent bouncing when running. ALL POLARIZED - Glare-reducing, polarized lenses and UV400 protection that blocks 100% of those harmful UVA and UVB rays.