JASON MARKK MOSO FRESHENER is a shoe-specific deodorizer that generously uses Moso bamboo charcoal and is housed in a waterproof fabric case. Known for its porous nature (with countless pores on its surface), bamboo charcoal absorbs various odor-causing components and moisture from the air. By placing the product inside your shoes for 1-2 days, unpleasant odors can be eliminated and moisture can be suppressed. To reactivate its deodorizing power, expose the product to sunlight (UV rays) for about an hour once a month, and its deodorizing effect will be restored for approximately one year. Please use the calendar printed on the product to track the number of reactivations.