Part of the RBX Strength & Conditioning Series, The waist trimmer increases core temperature for greater circulation and promotes sweating to help reduce excess water weight. One-size-fits-all neoprene construction stays tight and prevents slipping during excercize. Care: Hand wash in warm water with mild soap, rinse thoroughly. ** Do not use if you are allergic to neoprene. Not intended to be worn for more than 2 hours at a time.