Cuddly and soft fabric: Made of high-quality high-density core yarn, lined with a warm and skin-friendly sheep's wool. Our heated socks have built-in double filament heating elements that heat your feet quickly. These rechargeable heating socks are suitable for men and women and have a size of 37-47 (EU size)7500 mAh large battery: the heated socks are equipped with 2 pieces of 5 V 7500 mAh rechargeable lithium polymer batteries, which can provide you with heat for up to 14 hours. The heating socks have a button battery pocket to prevent the battery from falling off during sports4 temperature modes: the heating socks with battery have 4 temperature modes. By long pressing the button, you can turn the battery on/off, by briefly pressing the button you can adjust the temperature. 70C (4 LEDs on) for approx. 8 hours; 60C (3 LEDs on) for approx. 10 hours; 50C (2 LEDs on) for approx. 12 hours; 45C (1 LED on) for approx. 14 hoursHands-free: The Ferdiiz heated socks come with a mesh wash bag and can be machine washed without pilling or losing shape. In winter, please avoid contact with cold water and detergents to avoid dry hands. After washing, please allow the cable to dry completely before using itThe perfect gift for winter: The heating socks from Ferdiiz come in loving packaging and are the perfect gift for family and friends. Choose Ferdiiz socks heated and keep yourself and your loved ones warm all winter long.