Keep Your Body Keeping your body warm :9 heating zones. You can stay warm during all outdoor activities such as hunting, ice fishing, hockey, and even working outdoors.Warm and Cozy 9 heating zones are distributed across the collar, mid-back, as well as underneath the two pockets for core-body warmth. You can stay warm in all outdoor activities like hunting, ice fishing, ice hockey, and even outdoor work. Long-lasting warmth and safety : Our heated undershirt can be fully charged within 3-4 hours and will automatically power off when it reaches a certain temperature to protect one's body; fast charging takes only 2 hours. Can be used for 8 hours QUICK CHARGE & LONG LASTING - Fast heating in seconds with 10000 mAh battery. With 2 USB ports which can heat the vest and charge mobile phone at the same time. Battery pack can be replaced by universal 2.0A/5.0V battery. TEMPERATURE CONTROL - 3 available heating settings can be adjusted with just a simple press of the button. HEALTH CARE AND EASY WASH - Help promote blood circulation, relief pains from rheumatism and muscle strain. Perfect gift for parents, families, friends who have difficulty in fighting against cold weather in winter. Easy wash by hands or machine.