I've had them for a week now. So far they have kept me warm between 37F and 57F. I was surprised my hands were so warm after an hour in 37F. I plan to use them all winter. In colder temperatures I plan to wear Vortex windproof mittens over them. A bit pricey but worth it for a very breathable product. I've worn Gortex clothing for 25 years and I think it's worth every dollar.
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