Weston Heated Socks keep feet warm for up to 8+ hours with 3 heating levels: Low 110°F, Medium 120°F, and High 130°F. They are suitable for people with Raynaud's and cold feet. These socks are designed for both indoor relaxation and outdoor activities in temperatures as low as -25°F. They warm up in less than 60 seconds and fit US shoe sizes from 5 to 15, making them suitable for both men and women. These heated socks are made of premium material and are one size fits all. - Upgraded socks provide warmth on the soles, toes, and tops of the feet - Three heating levels: Low (120°F), Medium (130°F), High (140°F) - Helps improve bad circulation and extreme cold feet - Can withstand temperatures as low as -20°C - Ideal for snowboarding, walking, skiing, hiking, or outdoor activities in cold weather