I bought these for my wife as she has a problem with poor circulation in her hands and feet which are always very cold. She's been going out into the back garden very early in the mornings to get some basic exercise (spine damage now prevents her generally going out anywhere) but even with Goretex walking boots her feet get were getting painfully cold no matter how many layers of socks she puts on.
These insoles have made an incredible difference. She says she no longer finds the soles of her feet to be freezing cold (previously feeling like the cold was seeping up through the paving stones through her boots!) and instead her feet warm up quite quickly as soon as she starts walking. Her feet are no longer in pain from the cold!
We had previously considered buying her electrically heated (battery operated) socks but I didn't have much confidence in anything like that for her given reviews I'd seen around the internet. However, I'm now very glad we found this website and these insoles as they do exactly what we wanted without any of the fuss & bother of battery heated socks!
It's worth mentioning that these insoles are fairly thick and include arch support. You will need sufficient height within your shoe/boot to fit these without compressing your foot against the top of the shoe. These worked great in walking boots but weren't comfortable in smaller trainers. We measured the length of her foot and choose an insole that was 1cm longer to allow for toe spacing etc.
Theses insoles really do work, especially after I have worn them for a couple of hours and they have had time to "heat up" and keep the foot area warm however my toes still get cold. I will purchase more insoles because they have definitely made a difference.