Size guide Support our endangered birds with these Matt Sewell hiking socks. Part of our Matt Sewell + Silverstick collection. These socks are made in Britain and the colour was chosen to represent the endangered birds on the UK's red list. 10% of sales from this product go to Wildcard, a grassroots environmental conservation organisation focusing on rewilding Britain. 60% natural wool / 40% polyamide Terry loop construction Fully cushioned fit Silverstick print underfoot Recommended washing at 30° and hanging dry The Matt Sewell Hiking socks are a regular fit and true to size. Try this garment on at home. Returns in the UK are free. These socks are made in Britain using traditional methods and high-quality woollen yarns. In accordance with Õko-Tex Standard 100 and ISO 17050-1, the wool is coloured using azo and chlorine-free textile dye.