This sock has it all, perfect for Running, Racing and when you're on the bike. This 1000 Mile Tri Sock features the unique properties of Marfil, the fibre of the future. It is the lightest yarn available, with the lowest specific weight of any fibre ever conceived. The wicking property of Marfil is second to none, which means your feet stay cool and dry. The flat toe seams maximises comfort. Arch bracing provides a customised fit, top venting holes keep your feet cool under pressure. This sock is available in both men's and ladies sizes for an extra comfortable fit.(06/11) Available In Ladies - Click Here