15-pound resistance belt has a resistance of 30 pounds after being folded in half. According to relevant public information, the rubber elastic belt with a thickness of 4.5cm and a width of 13mm has a resistance of 15 lb in normal use and can provide a resistance of 30 lb after being folded in half. Elastic belt's resistance is usually expressed in pounds and kilograms. Elastic belt's main function is to help people gain weight during exercise. Elastic belt is made of natural latex, which can effectively improve muscle strength, physical activity and flexibility, effectively improve sports performance, and help to treat many chronic diseases of human body.