Dear friends, if you don't know which size to choose, please contact our customer service, he will refer to you Instructions Please prepare a mobile power supply with sufficient power. Ar the mobile power supply is succefully connected to the usb port on the heating clothes, please pre and hold the control switch on the clothes for about 3-8 seconds, and then the switch indicator on the clothes will start to glow and start working,Then you could pre the switch to switch the corresponding heating mode according to different needs,have a nice day and good mood! Features: Made of far-infrared carbon fiber wire heating element layer and soft skin-friendly materials to ensure a warm and comfortable touch. Intelligent temperature control, heated with knees, back and waist. Powered by any 5V / 2A USB portable charger, the USB plug is compatible with most portable chargers on the market. Which can start heating in 30 seconds, long duration and long heating time. 3-level adjustable temperature with indicator light to adjust the required temperature. Safety insulation design, built-in thermal protection module, 5V safety voltage, once overheated, it will stop running until the heat returns to the standard temperature. The washing machine does not affect the internal heating system to heat clothes safely and durable. Support hand / machine cleaning. Heating underwear helps to improve blood circulation, enhance metabolism, which is very suitable for people who are afraid of cold, Raynaud's disease, arthritis, poor blood circulation, and stiff joints. The best solution for various outdoor activities, such as skiing, fishing, joing, Hunting, biking, hiking motorcycles, protecting climbing dogs, Running, snow removal, etc. Specifications: Name: Heating Thermal Underwear Condition: Brand New Color: Black, Gray Gender: Men, Women Material: 95% Cotton + 5% Spandex, Carbon Fiber Wire Size: M, L, XL, XXL,3XL,4XL,5XL About shippingShipping and Packaging All items will be double checked and well packed before sending.Items will be dispatched within 2 business days after buyers pay for the order. It usually takes about 14 to 18 working days for delivering the package to the destination(for remote areas,it may take a little longer). Special Announcement:Please fill in the correct and detailed consignee, address and phone number in the order. For fast and correct delivery.If you do not receive order within 30 working days,please feel free to contact Customer Service before leaving Negative and Neutral Feedback, we will do our best to help you resolve the problem.TaxNo, you will only pay what is quoted as total cost at checkout, no more. You are not expected to pay any additional duties or taxes. If you are asked by Customs or our logistic partner to pay duties, please contact our Customer Service .Your 100% satisfaction is very important to usIf the product is not on good condition, You can return this product within 14 working days, please contact customer service center before returning.FeedbackYour satisfaction is our first priorityIf you receive the order and it is in good condition,we would be grateful if you would leave us 5 star Positive Feedback for the transaction.
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