Heat Holders - The ultimate thermal sock, they are what you need if
your're going to be out doors all day in the winter months, they excel
at keep feet warm on the coldest of days.
Heat Holders are made from a specially developed heavy yarn which has
extreme thermal qualities; they have a tog rating 2.34, (the tog rating
of the average thermal socks is 1.50, cotton socks just 0.40) They have
long pile cushioning and the inside of each sock has been intensively
brushed so they that not only feels soft against your feet but also
trap warm air close to the skin keeping your feet warmer for longer.