One of the biggest contributors of human scent is the head and neck area. Some the major factors are breath, hair, mouth odors, and odors from the top of the head and air escaping through the neck from the chest area. It is recommended that serious hunters purchase two headcovers as the large amount of odor fills this critical area quicker than the other, less odor-producing, zones. The Full Season Midweight Ultimate Headcover is a Scent-Lok cap with the headcover built right into the design. Easy pull down facemask for calling or anchoring a shot.