Efficient Heating System This heating shoe adopts advanced carbon fiber heating technology, which has high heat energy conversion rate and energy saving. The upper and lower heating pads make the soles and insteps of your feet warm at the same time. The carbon fiber heating element can improve the blood heat circulation of your feet, and play a role in keeping warm and analgesic. Temperature Adjustable & Safe and Long-lasting Battery Life The heated slippers for men women can be controlled by the intelligent temperature adjustment switch. With 4000mAh high-performance polymer lithium battery, it can last for up to 5 hours, and High Gear 2.5-3 hours , the Medium Gear 4 hours. In addition, the working voltage of 5V is much lower than the safe voltage of 36V for the human body, so you don't have to worry about getting an electric shock at all. Slow Rebound Gel & Anti-slip Waterproof Sole In order to bring a better experience to users, we use slow rebound gel as the synthetic part of the sole, which redistributes the pressure on your feet, allowing you to wear These electric shoes feel very smooth and comfortable. The non-slip sole can ensure that you stand and walk more smoothly in slippery places. You can wear it when walking outdoors without strenuous walking. Specially Designed For Cold Feet & Ideal Gift Good warmth retention effect makes this heated feet warmers can be worn indoors or outdoors. It is especially suitable for studying, working, watching TV or other activities in cold weather. You can give this heated slipper to friends, family, especially the elderly or people who are afraid of the cold on Thanksgiving, Christmas and other major holidays. 100% Satisfaction Guarantee & Worry-Free After Sales Made with washable super soft material, so your feet are pampered like a baby. If you have any questions about the quality of these foot warmer within 60 days,we can give you a new one or refund. Free warranty for one year.