When it gets really cold, I love to put on the toe warmers as it is amazing the difference these make when you put them on in keeping your feet warm. If you forget to put them on, you can feel the difference regardless of how good your winter boots may be.
The Heat Company Gloves, both the liner and the shell, have pockets for these warmers to help keep your hands warm!
I promise these make a big difference. I haven't had much luck with battery powered warmers and you can't travel with the fuel ones.
