Delfin Spa Women's Heat Maximizing Neoprene Waist Wrap (Tummy Toner) - BLACK Nylon, FAR-Infrared Neoprene & Polyester w/embedded Bio-Ceramic material Imported WOMEN - GREAT POSTNATAL TOOL to help reshape your tummy! (Not recommended during pregnancy). MEN - GREAT TOOL to help shape your abs. IFBB or Bikini FITNESS COMPETITOR? Shed water weight before a show! FEATURES: Adjustable with use of velcro edge (tighten to your perfect fit). Smooth seams throughout for comfort. Pocket with velcro tab closure for keys/cell phone (fits iPhone) storage during workouts. MATERIAL: Outer  Nylon; Inner  Polyester; Middle - 1.5mm layer of NEOPRENE with embedded Bio-Ceramic material (reflects body heat to increase perspiration!). Increased heat & molecular stimulation enhances effectiveness of exercise, increases blood flow & assists with calorie burning, when exercising. GREAT SUPPORT! Designed to help contour your stomach/lower back area. Several customers have shared that with continued use, it has lessened back pain  potential added benefit! (Review highlights in description). SIZING: Please measure yourself before ordering. In between? We recommend the smaller size. SMALL - Up to 28" Waist, MEDIUM - Up to 36" Waist, & LARGE - Up to 46" Waist. (Measurements are inches). VIEW PHOTO OF OUR SIZE CHART FOR ADDITIONAL INFO.