Okay, not a rave
My wife got these for long, winter walks. She has tried them out twice. First of all, they are one size fits all and do not cover the entire foot. So position them where you want the most heat. Secondly, she found that the insoles should sit out for at least 20 minutes and be noticeably warm before putting them on. She found it was easier to position them on her socks and then put her boots on. (She tried placing them in the boots first, but that didn’t work well for her. ) They were pricey, so not sure if we’ll be getting them again. There are similar products that are just for toes … which is where you want the heat concentrated anyway.

