Flame resistant foam padding forms a seal to keep out dust and airborne particles. Lenses are treated to prevent fogging. Strap has Quick Fit retainer for easy on/off. Design allows air to flow freely reducing heat. XS EASE Replacement lens system. Lenses provide 99% protection against harmful UV rays. Exceeds ANSI Z87.1-2010 High Impact requirements. Interchangeable temples/strap included with each pair.