Suitable for various scenes: thermal vest to help you through the winter easily. Ideal for outdoor activities such as snowmobiling, motorcycling, mountaineering, camping, hiking, skiing, fishing, hunting or office daily and business activities. Suitable for autumn and winter use. 1. Integrated heating module. smart heating 2. Waterproof, safe and easy to wash process design 3. Infrared heating, no harmful radiation, stable performance, soft and comfortable 4,3 temperature control levels Heating in cold winter and locking temperature to keep warm Temperature control electric heating vest Dual-control thermostat, electric heating, three-speed temperature control, comfortable and warm Electric black technology carbon fiber heating wire Constant temperature system, long-lasting temperature lock Fast fever Instantly heats up in seconds Safer than ordinary vests, 3 times hotter, heat conversion rate as high as 95%, no leakage and no radiation Size S Back middle length: 63CM Bust: 102CM Hem circumference: 100CM Shoulder width: 42.5 Size M Back middle length: 65CM Bust: 106CM Hem circumference: 104CM Shoulder width: 44 Size L Back middle length: 67CM Bust: 110CM Hem circumference: 108CM Shoulder width: 45. Size XL Back middle length: 69CM Bust: 114CM Hem circumference: 112CM Shoulder width: 47 Size 2XL Back middle length: 71CM Bust: 118CM Hem circumference: 116CM Shoulder width: 48.5 Size 3XL Back middle length: 73CM Bust: 122CM Hem circumference: 120CM Shoulder width: 49 Size 4XL Back middle length: 75CM Bust: 126CM Hem circumference: 124CM Shoulder width: 50.5