It’s easy! Simply machine wash sacks and sheets in cool or cold water with like colors. (Never use chlorine bleach or wash in hot water.) When washing SNOO Sleep Sack, please zip the sack completely and attach the Velcro armbands and leg flap to each other. This will keep the Velcro from clinging to (and damaging) other items in the load. Next, air dry or tumble dry on low heat, making sure everything is completely dry before using.