• Heated socks with built-in heating element that quickly warms the instep area to keep feet warm. • Powered by 2 lithium polymer batteries of 3.7 V and 4000 mAh, providing between 5 and 12 hours of heat depending on the temperature setting. • Three adjustable temperature levels: high (red), medium (orange), and low (green), easy to control with a button. • Made with high-quality cotton and spandex, they are highly elastic, breathable, and quick-drying. • One size fits all, suitable for shoe sizes between 38 and 46, ideal for outdoor activities such as skiing, hiking, and fishing. • Includes one pair of socks, two batteries, and an AC charger. • Product weight: 0.5 kg.