This FSB Pinlock Insert is for use on the X-Lite X-803 / X-803 UC / X-803 RS / X-661 Helmets.Prevents misting / fogging upDry Hydrophilic membrane absorbs moistureSuitable for X-Lite X-803 / X-803 UC / X-803 RS / X-661 HelmetsFSB (full silicone border) reduces the risk of foggingThe X-Lite Pinlock Insert is extremely tough and durable and offers outstanding optical clarity.Pinlock is well known for it s patented anti-fog technology in the global market and is expanding. Pinlock offer 3 different performance levels in our range of insert lenses, to enable everyone to enjoy a clear and fog-free vision when riding. The insert lenses range starts from the Pinlock 30, Pinlock 70 and Pinlock 120 lenses. The number is used to describe the levels of fog free clearance the insert lenses provides in order to acclimatise to temperature differences that cause helmet shields to fog up.Pinlock anti-fog inserts clip between two adjustable eccentric pins located in your helmet visor, these inserts can