About this item Velvet fabric 🔥🔥【Rapid heating, no fear -122℉】: WINNA heated foot insoles are heated by the forefoot, which heats up quickly to High Temperature, which is very suitable for skiing adventure, outdoor work, hunting, fishing, running, cycling, Skiing,hiking, etc. 🔥🔥【3-Gear Temperature control】Effectively saving battery life, suitable for Winter outdoor and indoor activities, ensuring dexterity, maximum comfort, and protecting your feet. 🔥🔥【Cut to the right size]: This Thermal Insoles provides you with a trimable area with Multiple Sizes , Unisex,so you can customize them to get the perfect fit. 🔥🔥【Large capacity battery-cycling heating】: 7.4V 2000mAh rechargeable lithium polymer battery Operated , cycle charging and heating to (40°C-65°C), battery life can reach 3.5-7 hours. 🔥🔥【Trusted brand, one-year warranty】: WINNA focuses on the research and development of smart electric wearable products, and is trusted by customers all over the world. Strict quality control is the foundation of our survival. After purchasing the product, if there is any quality problem within one year, we are willing to provide free return and exchange.