*Size is Asia Size, M = us (XXS), l = us (XS), XL = us (s), XXL = us (m), 3XL = us (L), 4XL = us (XL), 5XL = us (2XL).     *Constant temperature heating, step-by-step warmth, improved chip parameters, under premise of rapid heating, optimize and adjust the progressive speed of heating, gradually increase the temperature, not feel sudden.   *Fine selection of down material, warm and soft. *Upgrade the heating module, can improve the heating speed, strengthen the thermal effect, press the button to start, warm can be felt. You can use it by pressing the key 2S next to the pocket. *USB interface with cover, convenient and fast. *The back is designed with reflective strip, which makes you feel safe when walking at night. Note: due to the characteristics of the filling material of this product, there may be some taste in the real object. Please take it carefully. Specifications: Name: intelligent heating down vest Fabric Name: chemical fiber blended fabric Main fabric composition: Polyester Content of main fabric composition: 100% Filler: white duck down Cashmere content: 76% ~ 80% Style: Vest Length: regular (50cm ＜ length ≤ 65cm) Collar type: stand collar Hooded or not: not Hooded Placket: zipper Thickness: Pattern: solid color Style: England Suitable crowd: middle aged Applicable scene: Leisure Suitable season: autumn and winter Function: keep warm Style details: stereo version of hem Color: black, blue, dark gray Size: m, l, XL, XXL, XXL, XXXXL, 5XL Year / season: Autumn 2020 Package Included: 1*vest Notes: Please note About size: Please allow 2-3cm (0.4-0.7in) measurement error. Thanks for your understanding. 2 Asian size is smaller than EU / US / UK size, please check the detailed size information before purchase. Thank you very much. This is Asian size, two sizes smaller than European size. We suggest you choose a size three larger than usual. If you are not sure, please contact us before placing an order. If you tell us your weight, height and other information, we can help you choose the right size. A