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they are great, and last long, we bought them for a family holiday in japan, skiing in the cold weather, and well they last a long time, we only actually used 10 of the 40, but we can save them for future winters!
Wish I had bought these at the beginning of Winter. Kept searching in vain for a decent heated fingerless glove for use at work as an electrician outdoors. I can slip these into some standard fingerless gloves and they stay warm all day. They are not too hot next to the skin in the palm of the glove.
hesitant to buy these, but must say i am sold on them. keep my hands warm at -18 in work gloves. a must have if spending a lot of time outdoors in the winter. when finished my shift i folded them up in a zip lock to seal the air out and reused them a day later for a bike ride. still worked fine and not counting the time they were stored warm used for a total of 6 hour use and counting