Hello, this product does not include a battery or a power bank, please check it clearly, thank you very much.M size: tube length 30cm, sole length 18cm, sole width 8cm L size: tube length 33cm, sole length 20cm, sole width 9cm[The Best Companion for Outdoor Sports] This neutral heated socks are suitable for various outdoor activities, such as skiing, hiking, cycling and other activities. These socks will make you forget the cold and let you concentrate on enjoying the outdoors. In the severe winter, the electric socks as a gift to outdoor workers and people with Raynaud's syndrome to keep their feet warm. A ideal gift for Winter Thanksgiving Day and Christmas Day.[Soft Breathable, Soothing Feet] Enjoy the feeling of keeping your feet warm and baking, without worrying about itchy materials. Double thick inner layer with fluff, full of elasticity, soft and breathable. Provide you with the best comfort experience and multiple times the heat of ordinary socks. At the same time, this heating sock is easy to clean and supports machine wash and hand wash(with laundry bag). Please follow the manual before washing.