Check the listing for details. Woolpower Socke 400 - Pine Green. Color: pine green, Condition: New with tags. Listed at 23.50 USD. Socks 400 are made from Ullfrotté Original. This warm sock can be worn directly on the foot, but is also suitable as a second layer over a slightly thinner sock. Woolpower AB in Östersund has been producing socks since the company was founded in the early 1970s. That's why we know how important it is to keep your feet comfortably warm and dry at all times; both during work and during leisure activities. The soft terry cloth side can be worn directly on warm skin. To achieve the best effect, wear a thin, well-fitting sock directly on the foot and layer a thicker one over it if necessary. So far it has not been possible to produce a synthetic fiber that has such fantastic properties as wool. The terry-knit material can absorb up to 30 percent of its own weight in moisture without feeling dam.