Features: brand new and high quality Quality lycra material, high elastitcity, skin-friendly, soft and comfortable to wear. Heating thermal socks, cover the entire sole of the foot and foot back. Promote circulation. Great for people with poor circulation, stiff joints. Fast and long-lasting warmth: plug in the rechargeable battery.(power bank not included) Machine washable, adjust to gentle cleaning, or hand wash, remove the battery before washing Used for winter outdoor sports, such as skiing, hiking, hunting, snow shoveling, fishing, cycling, etc. Package Includes: 1 pair(2pcs) x Heated Socks Specifications: Material: Lycra elastic fabric Recommended Foot Size: 36-44 Optional Color: Black(double-sided heating), Gray(double-sided heating), Black, Gray Quantity: 1 pair(2pcs) note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you