The Sealskinz Thermal Liner Sock for men are designed to be worn by themselves or with Sealskinz socks, to give an additional thermal layer of insulation. It is made using fine Merino wool giving excellent wicking performance, keeping your feet dry and comfortable. Features: Designed to be worn by themselves or with Sealskinz socks to give additional thermal layer of insulation Made using fine Merino wool lining giving excellent moisture management Close-fitting Glossary: Merino One of the highest quality wools grown from sheep. Merino wool wicks moisture from your skin to keep you dry. Its properties keep you cool when its hot and warms you when its cool, which makes Merino wool ideal for any weather