Source factory dedicated to new product development and innovation, producing power banks for 16 years and electric heating clothes for 12 years with guaranteed quality. Warm reminder:(The socks are highly elastic and suitable for both men and women in sizes 36-44.) 1. Electric heating socks and power banks are sold separately; it is recommended to use the dedicated power bank produced by our factory for electric heating socks! 2. Electric heating socks are personal items and cannot be returned or exchanged after being worn. Please be cautious before placing an order. Thank you for your support and understanding! 3. After receiving the goods, plug in the power bank to test the temperature (roll up the socks to test the temperature, don't leave them open). The temperature will be very high in about 3-5 minutes. Other matters: 1. New colors and new styles, minimum order quantity is 1000 pairs per time, please communicate with customer service for specific details. 2. Packaging method: Each pair of electric heating socks is packed in an OPP plastic bag, and for large orders, they are securely packed in cardboard boxes for shipment. 3. Can be washed by hand or machine: When washing by hand, be careful not to vigorously rub the wires and heating element areas. When machine washing, please place the power plug inside the sock pocket before putting it in the laundry bag for washing. Lay it flat to dry before use, and remember that there must be no moisture inside the power plug. Our store defaults to using YTO Express for shipping small items. If you need other couriers or logistics services, please contact our customer service for further discussion.