The HK Army HSTL Thermal Lens Clear is a replacement lens for your HK Army HSTL Paintball Goggle, and is composed of virgin optical-grade GE polycarbonate. Inherently UVA/UVB and IR shielded, every HSTL lens shields your eyes from dangerous sunlight under every playing condition. The interior thermal lens features 3M Foam Sealant, trapping a layer of cool-barrier insulating air, eliminating condensation and encouraging evaporative cooling, which keeps your goggles from fogging.