- ALL NATURAL bamboo charcoal. UNSCENTED eliminating instead of masking odors . LASTS UP TO 1 YEAR recharge under sunshine every 30-60 days .Usage: Keep your boots fresh and odor-free by placing one pouch in each boot when not being worn.Product Care: Place bamboo charcoal pouches outside under direct sunlight (2-3 hours per side) every 30-60 days. At the end of its lifespan, the bamboo charcoal pieces from the product can be mixed with gardening soil.Bamboo charcoal is produced from the rapidly growing moso bamboo. it has countless tiny holes that give the resulting bamboo charcoal its revolutionary abilities as both a deodorizer and dehumidifier. Unlike other deodorizer, this one is chemical free, organic, and completely biodegradable, so you can breathe easy in more ways than one. [sustainable + reusable + recyclable] Purify by Nature!