The H2Odor Sponge is one of the most effective, easy-to-use moisture and odor removal systems available. Place the H2Odor Sponge in your boots, clothing bag or weapon case, and let them do the work. In 2-3 hours, the odor eliminating technology absorbs and retains the moisture and odor, leaving you with odor-free boots, clothing, or gear. The H2Odor Sponge is a 2-piece odor elimination system.