Material: spandex + thickened crystal fleece. Skin-friendly, breathable, flexible, windproof, thick, cosy, thermal, keep your waist, stomach and back warm and comfortable in cold weather. It always provides enough warmth and safety for the waist and stomach.Back warmer with Velcro fastener: the heat belt has a Velcro fastener, and you can adjust the length of the belt to your needs. Our back strap has a certain elasticity and fit, provides safety and increases friction between belt and waist, making the belt less slippery.Warmth and protection: this belt is suitable for use in low temperatures, wrapped around the waist or back, prevents cold, promotes blood circulation, relieves menstrual pain, lower back pain and is suitable for women and elderly, as well as for office workers and truck drivers, etc. Useful in a variety of sports protection, perfect for outdoor activities in winter and cold autumn, such as cycling, motorcycling, snowboarding, hiking, climbing, hunting and running.