- Sock is made of polypropylene fibres. * A thermal fibre, whose qua specific weight is the lightest available. * Fibre is moisture resistant and moisture transportable. * Sock has a mesh knitted backside for perfect fitting and comfort. * Sock has an elastic top. * Sock has a new anatomic foot for improved fitting andcomfort. * Left-right system. * Washable at 60 degrees, non bleed and available in five sizes. * In many different colourcombinations available.