Pack of two. Cotton stretch fabric. Knee-high length. With Aegis Active Freshness a specially designed technology which helps to keep your socks fresh and odour free. This product has been given an anti-microbial treatment to prevent the development of odour which will keep your socks feeling fresh. BIOME Is a specially designed technology which helps to keep your socks fresh and odour free bi-ome trademark of devan chemicals NV. This product contains the biocide linseed oil.