The Native Throttle is designed to fit a wide range of face sizes and shapes. From smaller to larger faces, this is the frame for you! The frames are a simple wrap that is great for all sports. The Polarized lenses virtually eliminate glare. Rhyno Tuff air frames Venting above the lenses Self Adjusting Cushinol nose pads Mastoid temple grip Anti Ocular intrusion system Snap back interchangeable lens system Polarized lenses block 100%UV ABC and meet ANSI Z80.3 standards.Note: these sunglasses are designed for easy lens interchangeability, but do not come with spare lenses. They are available as an accessory.