The fine inner sock is made from Meryl® that draws moisture away from the foot and transfers it to the outer sock. The dri-release® outer layer is great at drying to leave you feet feeling dry and comfortable. This double-layer construction prevents friction from occuring on your feet and blisters from appearing. The durable heel and toe sections help you put the miles in making Twin Skin® a trusted partner of many runners. The LYCRA® SPORT fibre ensures a close, comfortable fit. Available in a variety of colours and also in a socklet length. Socks designed and manufactured by HILLY, the UK's premier technical performance sock company for runners - founded by Ron Hill. Double-layer construction prevent friction on the foot Lightweight and fine Meryl Sport inner effectively transfers moisture to the outer DriRelease cotton outer layer ensures superb drying rate Durable heel & toe box yarns Vented upper and outer Inner sock arch grip 58% Polyamide (Nylon), 19% Polyamide (Meryl Sport), 15% Polyester, 4% Cotton, 4% Elastane (LYCRA Sport)