Scent Killer Sports Equipment Deodorizer Pucks begin to fight odor and moisture as soon as you take them out of the package and are the perfect complement to complete your stinky sports odor elimination regimen. Slide a puck in sports shoes, sneakers, cleats or skates, sports bags or totes, or any enclosed container where sports odors and moisture build up. Ozone free – no batteries required. *Replace each season. If exposed to excessive moisture and odor, effectiveness can diminish, and early replacement may be needed.