AVAILABLE SIZES: These heated boot insoles with ultra-thin, lightweight design are available in different sizes. S/M: Men's 4-9, Women's 5.5-10 with L/XL: Men's 9.5+, Women's 10.5+. HEAT SETTINGS: The heating insoles have a built-in 3.7V rechargeable batteries. There is different estimated heating time for different heat levels. High (III): 130F – 3+ Hours Medium (II): 110F - 5+ Hours Low (I): 110F – 8+ Hours. HOW TO USE: Use the charger kit to get the full charged batteries. Place the heat shoe insoles in shoes or boots. Choose the desired heat setting by pressing "I" "II" or "III" on the controller or on the back of the insoles. HEATING SYSTEM: The electric heated insoles have strategically placed ultra-fine heating panels under the toes. With three different heat settings, these insoles can work up to 8+ hours while reaching up to 140F. FOOT WARMER: The heat insoles are designed to keep your feet warm in low-temperature zones. Whether you are hiking, hunting or on a ski trip, these insoles protect your feet from cold winter winds.

Date First Available: June 30, 2019. Best Sellers Rank: #306,138 in Health & Household. Customer Reviews: 3.7 3.7 out of 5 stars 84 ratings 3.7 out of 5 stars. : B01N7VLJK7. Size: ?Large/X-Large. Part Number: ?AH-INS-LI-01-L-XL. Manufacturer: ?ActionHeat. Number of Items: ?1. Color: ?Black. Brand Name: ?ActionHeat. Item Weight: ?1 Pounds. Package Weight: ?0.5 Kilograms. Item Package Dimensions L x W x H: ?13.82 x 4.8 x 2.05 inches.