Description Certified conformance to medical standard – BS6612. Designed to improve blood flow, which in turn helps to flush lactic acid during, and post, training and racing. Provides circulation improvement and an improved recovery rate. This compression sock also reduces calf muscle oscillation. Made from Tencel® for a super soft hand feel and from LYCRA® SPORT to ensure a close, comfortable fit. Socks designed and manufactured by HILLY, the UK's premier technical performance sock company for runners – founded by Ron Hill. Graduated compression in leg to BS6612 standard Reduced calf muscle oscillation Increased blood-flow helps clear lactate Proven circulation improvement Improved recovery rate Tactel® – super soft hand feel Best calf fit Available in various calf widths Wear with your favourite HILLY sock Our Compression sleeves utilise calf and leg sizing to provide optimum fit and premium compression benefits. Size Large Part of Calf Height Sock Size (UK) Sock Size (EU) Sock Size (USA Men) Sock Size (USA Women) S 30-34cm 25 – 35cm 3 – 5.5 35.5 – 39 4 – 6.5 5 – 7.5 M 34-38cm 30 – 40cm 6 – 8.5 39.5 – 42.5 7 – 9.5 8 – 10.5 L 38-42cm 30 – 40cm 9 – 11.5 43 – 46 10 – 12.5 XL 42-46cm 40 – 45cm 12 – 13 47 – 48.5 13 – 14