The XSG glasses have non-flammable, foam padding, which forms a seal to keep out dust and airborne particles.The lenses are treated to prevent fogging, scratches and static and the design allows air to flow freely reducing heat-interchangeable temples and straps are included. With each pair and the strap has a Quick-Fit retainer for easy on / off, the lenses in the XSG goggles provide 99% protection against harmful UV rays and feature the XS system replacement lens facility.