The Bollé Coverall Safety Goggles are cost effective and functional. They protect against impact and chemicals as well as large and fine dust particles. Fitted with an optical class 1 polycarbonate lens that has an anti-scratch and anti-fog coating. The goggles are secured via the adjustable nylon branded strap. They also fit over prescription spectacles. BOLCOVARSI: Sealed Goggles (EN 166/170 1BT 3,4).BOLCOVERSI: Ventilated Goggles (EN 166/170 1BT 3,4,5 K,N).