The endura snapper ii glasses the endura snapper ii photochromic glasses feature a 2 piece photochromic lens that adjusts to changing light conditions the lightweight frame has rubber touch temple tips and a soft rubber touch moulded nose piece supplied complete with hard case and soft wipe microfiber carry pouch light reactive lenses use photochromic technology for a rapid response to changing light conditions the lenses respond in 7 seconds to light exposure and offer full uv protect