This waist trainer belt is smooth, comfortable, and highly elastic (not easy to wrinkle or deform). It can be worn inside or outside to increase your core temperature during exercise without irritating your skin. The neoprene fabric trimmer belt makes you sweat 3 times more than usual to accelerate the calorie burning process, keeping your muscles warm and supported, while preventing post-workout fatigue and injuries. Built-in 13 steel bones prevent the waist trainer corset from rolling down or shifting as it fits snug to your midsection to relieve back pain and correct your posture. The 4-row hooks and the 2 wide hook & loop fasteners are fully adjustable for close fitting.
•Outside fabric material: Polyester+Nylon; Inner material: Neoprene