Most boot shoe and sandal deodorizers mask the smelly bacterial residues in hiking climbing and beachcombing footwear but Granger's Odor Eliminator has a long-lasting formula that treats foot odors without perfumes or other scents. The water-based formula is safe for all fabrics and tested in GORE-TEX® footwear. It comes in two sizes although many backpackers swear by the 2-oz. portable version especially in cramped ultralight tents where inhabitants sleep head-to-foot like sardines (sans odor).