Slimming principle of Waist Trimmer Belt Neoprene technology material,increase the temperature of subcutaneous fat after your wearing, make blood circulation faster, accelerate the oxidative decomposition of fat, increases the calorie consumption rate of subcutaneous fat, and greatly improve the effect of reducing fat through exercise. Bigger Velcro Strap Longer-lasting, strong adhesion, flexible elastic adjustment, you can wear it under any sports apparel. The Velcro does not slip even during intense workouts. Latex-free Neoprene Material The grid inner lining of the waist trainer to repel moisture absorption and prevent slipping. Extremely comfortable, lightweight, ideal for any kind of fitness activity. Durable Stitching Complete overlocking seams ensure maximum durability. Prevent fray in intensive exercise and always stay in place, no risk of slip or moving of the waist trimmer.