These long-heating, rechargeable socks are made of premium cotton with an ergonomic design, offering excellent breathability and sweat-wicking properties. Equipped with a 4000mAh battery, they provide up to 10 hours of warmth. With three heat settings and carbon fiber heating elements, your toes will quickly feel warm in temperatures up to 140°F. Perfect for those who feel cold in winter and ideal for outdoor activities like hunting and skiing. **Features:** 1. **Long Heating Time:** Rechargeable heated socks are equipped with a 4000mAh large-capacity battery, providing up to 10 hours of enduring warmth. 2. **Material:** These heated socks are made of premium cotton. Combined with an ergonomic design, the socks have good breathability and excellent sweat-wicking properties, ensuring comfort. 3. **Multiple Heating Methods:** The heated socks are designed with three heat settings: high, medium, and low. The socks reach temperatures from 113°F to 140°F and can last up to 4 hours. 4. **Upgraded Heating Design:** The heating element of these socks has been upgraded to a carbon fiber line heating element, hidden in the forefoot area, so your toes will quickly feel warm, and you'll no longer be afraid of the cold. 5. **Widely Used:** Ideal for people who often feel cold feet in winter. They are also great for men and women who love hunting, skiing, ice fishing, and other winter activities. The special pocket design for the battery pack provides full comfort whether you are walking, running, or sleeping. **Specification:** * **Material:** Cloth * **Color:** Black * **Size:** 13 x 10 x 2 inches * **Weight:** 175 g, 170 g, 140 g * **Battery:** 4000 mAH, 5000 mAH * **Voltage:** 3.7-5 V * **Temperature:** 45-60℃ **Package Includes:** * 1 Pair × Heated Socks or * 1 Pair × Battery