ADJUSTABLE TEMPERATURE: This heated socks are designed with 3 temperature levels, which can be adjusted according to the outside temperature and personal preference to meet your different needs. Using two 7.4V 2200mAh lithium batteries, compared with other 3.7V or 5V batteries on the market, the heating rate is faster, the work is more stable, the energy density is higher, the life is longer, the size is small, the weight is light, and it is easy to carry. PREMIUM MATERIALS AND DESIGN: These heated socks are made of comfortable, soft, breathable, stretchy and thickened materials; ergonomically designed with heating implanted in the forefoot, toes and instep, cold-prone areas and precision stitching Silk. Keep your feet comfortable and warm. Hidden elastic ultra-fine wire is used to avoid discomfort and prevent stretching and damage to the circuit. SAFE AND RELIABLE: This heated socks has passed various safety certifications. Wear it in winter and you can go camping, running, biking, skiing, skating, hunting, fishing, walking, duty, snow shoveling and various other outdoor activities. Infrared heating can promote blood circulation. Ideal for people with , poor circulation and stiff joints. So it's also a great gift option, perfect for Thanksgiving, Christmas. color: grey Packing list: 2pcs