LensCoatA(R) for the Canon RF 100mm f/2.8L Macro ISLensCoatA(R) for the RF 100mm f/2.8L Macro IS lens cover offers your valuable equipment some protection from scrapes and bumps, preserving its resale value. It also helps break up the shape of your lens, making it less noticeable to wildlife.The neoprene LensCoat acts as a thermal barrier making the lens more comfortable to handle in hot and cold tempertures. The LensCoatA(R) RF 100mm f/2.8L Macro IS features a clear plastic windows over the auto focus, focus limiter switch and IS switch.