ESS Modular Technology allows all lenses to be quickly and inexpensively interchanged. ESS FirePro Replacement Lenses offer distortion-free clarity and are built from extra-thick, 2.8mm high-impact polycarbonate. ESS' advanced ClearZone FlowCoat lens coatings maximize scratch resistance on the outside of the lens and fog resistance on the inside. All FirePro replacement lenses offer 100% UVA/UVB protection and are compatible with ESS FirePro-FS and FirePro-EX goggles. Available in Clear, Smoke Gray, and Hi-Def Yellow.