Heat Factory Heated Back Wrap for use Hand & Body Warmers Accommodates two Heat Factory Large Body Warmers Adjustable Velcro strap; machine washable Large fits 25" to 44" waist; XL fits 27" to 46" waist; XXL fits 29" to 48" waist Made in USA Includes 2 Heat Factory Body Warmers; warmers last up to 20 hours each