This waist trimmer is made of neoprene, polyester, and latex. These three materials make a solid bond which is perfect for creating a sauna-like environment around your abdomen and back area. Its adjustable Velcro fastener provides a secure and firm closure. It prevents the trimmer from slipping down when exercising. Besides aiding in losing weight, this belt is also ideal for post surgery, after pregnancy, after a c-section, etc. Waist Cincher Tummy trimmer is also perfect for improving posture, relieving muscle pains and providing muscular support.