Fits Small 34'l x 7'w For waists up to 34 Increases core temperature during exercise Improves thermogenic activity and sweat Made w/ neoprene for heat insulation, contoured for lower back support Fits comfortably and is naturally flexible, adjusts to shape & size Simply stretch it around your middle, secure the Velcro closure, and you're set Manufacturer unknown, purchased wholesale from vendor for fitness store. I've tried about 6 different brands w/neoprene and they all work the same for me.