The company was good enough to send me a pair of these to try out if I’d review them. I have severe Raynaud’s and my feet are a real concern. These might work for someone who has a milder case but my feet still got very cold with them. I queried the company and they said that they found that they took longer to work for people with Raynaud’s. Don’t really know what that means because the longer my feet are cold the less heat there is in them to warm up the insoles.