Retailer Category: triathlon base layer mens socks and calf guards Brand: 1000 Mile The 1000 Mile Tri Sock features the unique properties of Marfil; the lightest yarn available. This has the lowest specific weight of any fibre ever conceived and the wicking properties of Marfil mean your feet stay cool and dry.The flat toe seam maximises comfort, while the Arch Bracing provides a customised fit. Top Venting helps keep your feet cool under pressure. £5.41 Add to my Running bag