They have kept my feet perfectly warm in -8 temps for 3 - 4 hours (I haven't worn them longer) without wearing out the battery. I have worn them to the barn for two hours in the morning, not charged them and worn them for another two hours in the evening with no loss in their ability to keep my feet warm. It takes them a while to fully charge so I just leave them plugged in overnight. I highly recommend them so far.

I am always cold so I was really excited when I found these heated insoles. They they don't get super hot and offer enough heat to keep me warm outside for a long time. Insoles can be cut to fit various shoe sizes. I cut them to my shoe size but they still work in my spouse 's shoes that are bigger. Warms up very quickly and battery lasts for several hours. I love it!

These work fine - my feet stay warm for about 4 hours. They only feel hot if I am standing still with my feet firm on the floor. When walking and hiking I don't notice them or the cold - problem solved. The form factor of having a battery strapped to your leg isn't ideal but it works. I am hoping the insoles with batteries in them will be a viable future solution.

Excellent heated insoles don’t keep your feet warm for hours. These came on time and as described. They are an excellent value and in the long run they’re gonna save us so much money over buying the throwaway warming pads for my feet. This is a great product for anyone that works outside or there’s any kind of outdoor walking or outdoor sports easy to cut to any size foot. Excellent value. Hold a charge. Happy with this item.

Working outside in brutal North Dakota weather - these warming insoles are a Godsend..!!! Tried battery / re-chargable sox - they fell apart right away + were very inconvenient to use. These fit perfectly inside of my workboots and keep my toes toasty warm.