The M size corresponds to the palm is 11cm wide and the middle finger is 8cm long. The XL size corresponds to the palm is 12cm wide and the middle finger is 8.5cm long.Please choose according to your actual palm sizeThe Heated Skiing Gloves provide a wide heating area covering your whole back of the hand and all fingers in case of poor blood circulation, arthritis, cold weather, or simply for more comfort and warmth.Unique five fingers and back of hand heating layout, rapid heating from fingertip to palm, threaded wiring design, soft and delicate, to prevent pullingConnect the battery with the connector in the glove, put the battery into the battery bag, zip up, after about 5 minutes, the glove is heated inside, up to 55 degreesThe flexible heating fiber is combined with the inside of the glove to form a whole, which has good heating effect, effectively prevents heat loss, transmits more heat to the inside of the glove, and feels comfortable and not stiffComprehensive waterproof treatment: the glove surface is made of water splash proof fabric, and the surface is waterproof while preventing wind. The zipper is coated with waterproof treatment, which has good waterproof effect, no tearing, good smoothness,flat and delicate surface, and has a smooth feeling similar to leatherNote: This product does not contain battery or power bank