M Customizable Warmth: Choose from three temperature settings (Low: 40 C/104 F, Medium: 50 C/122 F, High: 60 C/140 F) to keep your feet comfortably warm in any weather. Heating Element and Battery Safety: We've incorporated advanced safety features into our Electric Heated Socks to protect against any heating element and battery concerns, prioritizing your safety for a secure and cozy experience. Long-Lasting Heat: Our upgraded battery can provide up to 9 hours of warmth on the lowest setting and 4 hours on the highest. Keep your feet toasty all day without worrying about running out of power. Winter Outdoor Adventure: Don't let cold feet ruin your outdoor fun. These electric thermal socks are ideal for winter sports, hunting, camping, skiing, and more.