The ScentBlocker Ulti-Headcover features a cap design with a hinged facemask built-in for complete coverage of one of the most potent odor hot spots on the human body. The headcover utilizes Cold Fusion Catalyst(TM) technology to adsorb odors while a wicking treatment helps manage moisture to keep you comfortable all day long. Cold Fusion Catalyst(TM) For adsorbing odors Smooth, quiet polyester hat With a warm merino fleece lining Deadly quiet ultra-soft fleece facemask Keeps you warm and comfortable Built-in cap design For convenience and comfort Real cam lock Provides a secure fit