Thermolite fibres are hollow to help keep a layer of warm air around your feet, without increasing weight or creating unwanted bulk.
Anatomically cut to fit your left and right foot, this helps prevent bunching or pressure points in your shoes. A long cuff provides some extra ankle warmth and protection under tights and overshoes.
Recommended temperature range is between -6 and 6°C. We found them to be cosy and durable and importantly they didn’t affect the fit of the shoe.
Some thicker winter socks actually result in colder feet by making shoes tighter and restricting blood flow, but not these.