Fabric composition: 95% Polyester + 5% spandexHeating material: Metal fiber Heated area: Tops: shoulders + back + abdomen Pants: back waist + abdomen + knees Suitable seasons: Spring + Autumn + Winter Applicable people: Men Power supply mode: 5V 2A power bank Size: M, L, XL, XXL, XXXL, XXXXL (Please refer to Size Chart in the picture, choose the clothes that suit you best according to your own size, and choose a larger size if you are obese or prefer loose.) Package Include: 1 x Heated Underwear Set (Package Not Included Power Bank) Wash and Care: Machine wash can be done. When washing, please remove the battery. If it is machine wash, please put the clothes into the laundry bag to wash. To ensure the service life of the clothes, try to avoid strong washing and dry normally. Note: Underwear needs to be connected a power bank to work,it will stop heating after power failure Zero Radiation and Safety.Heating Underwear can realize and zero radiation When you place the order please leave the message with your WEIGHT(KG/LB) and HEIGHT(CM/IN). We will help you to confirm the size.Thank you !