Feature: Specification: Features: Wide Applications: These heated socks provide powerful warmth and comfort while riding, skiing, hiking, fishing, etc. Great for arthritis foot and chronically cold feet, giving you a warm winter. Powered by a pair of 3.7V rechargeable Li-ion batteries (contain), the heat energy of the product is 35-55 ℃. 3 Adjustable Heated Levels: 3 levels setting heat controller to adjust your favorite temperature according to different temperature demands. This battery heated socks use composite fiber heating material, and built-in heating elements covers whole forefoot, which can stimulate the blood circulation, and keep you warm all day. Heat quickly and you can feel temperature in 30 seconds. Keep your feet warm and healthy in winter. Made from 100% cotton material, these socks are absorbent, breathable, washable and quick-drying. Super comfortable, thick and durable. Specifications: Battery Voltage: 3.7 Volt Capacity:2200Mah Colors Available: Black, Gray(optional) Unisex Fit DC interface: 3.5*1.35mm Material: 100% Cotton Size: 28*23*9cm Package size: 14*10*5cm Package weight: 300g Package Includes: 1 Pair Heated Socks 1 Pair battery 1 USB Package List: