Nitro - Ultra low profile design, fits under hard hats and fire fighting helmets, Spherical lens offering brilliant optics & peripheral vision, Medium impact and splash approval ALS anti-fog/anti-scratch coating on both sides of clear and smoke lenses. HIGHLIGHT FEATURE High temperature, fire fighting approved version including high temperature head strap WEIGHT 62 Grams PVC Standards approved to AS / NZS 1337 for medium impact and splash protection