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. Reflex lenses are ideal for people who want an extra dark lens with a light mirror coating. 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.