The vest has three levels of temperature adjustment, and the use of a 5v USB power bank can last for a long time, allowing you to enjoy activities in cold weather. Made by fine sewing and excellent craftsmanship, the vest possesses the superiority of fast heat generation, pulling resistance and high-temperature resistance. Made from carbon fiber and chloroprene rubber material, which is durable and lightweight. There are six sizes to choose from: M, L, XL, XXL, XXXL, 4XL. And the folding length is about 38 cm, the width is 30 cm, the thickness is 5.5 cm. With this vest you can do outdoor activities in cold weather for better performance, like outdoor work, cycling, fishing, traveling, outdoor sports, outings, etc. Item Name: Heated Vest Material: Carbon Fiber,Chloroprene Rubber Style: Casual Gender: Unisex Season: Winter Length: Regular Neck: V Neck Sleeve: Sleeveless Power Supply: Power Bank (Not Included) Heating: 3 Heating Levels, 5 Heating Zones Features: Adjustable Temperature, Fast Heating, Energy-saving Size Details: Folding Size: 38cm x 30cm x 5.5cm/14.96" x 11.81" x 2.17" (Approx.) Size: M, Bust: 96cm/37.8", Waist: 96cm/37.8", Length: 60cm/23.6", Shoulder: 37.5cm/14.8" (Approx.) Size: L, Bust: 100cm/39.4", Waist: 100cm/39.4", Length: 62cm/24.4", Shoulder: 39cm/15.4" (Approx.) Size: XL, Bust: 104cm/40.9", Waist: 104cm/40.9", Length: 64cm/25.2", Shoulder: 40.5cm/15.9" (Approx.) Size: 2XL, Bust: 108cm/42.5", Waist: 108cm/42.5", Length: 66cm/26", Shoulder: 42cm/16.5" (Approx.) Size: 3XL, Bust: 112cm/44.1", Waist: 112cm/44.1", Length: 68cm/26.8", Shoulder: 43.5cm/17.1" (Approx.) Size: 4XL, Bust: 116cm/45.7", Waist: 116cm/45.7", Length: 70cm/27.6", Shoulder: 45cm/17.7" (Approx.) Notes: Please refer to our size chart and choose the right size. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Tip: Remember to take out the power bank and put the USB plug in your pocket before washing. Portable and removable USB socket, 5V safety voltage, output needs DC5V, 2A. The first time you use it, you need to run out of electricity and recharge it, with a long battery life of 8 hours (take a full 10,000 mAh power bank as an example) Package Includes: 1 x Heated Vest