Size: Fit for men’s waist L 34inch-38inch,XL 40-48 inch Belt Total length:L 39.37inch,XL 49.21 Material: 70%Neoprene 15%Polyester 15%Elastic Nylon Benifits: 1,Adjustable Closure 2,Comfortable to wear under workout apparel 3,Help Shed Excess Water 4,Creates a Portable Sauna 5,Support Lower Back 6,Improve Posture 7,Keeps Muscular Warm. 8,Enhances Aerobic Posture