1000 Mile Cross Sport Socks - SS18 23% nylon Padded zones - For protection and comfort. Soft material - Minimises friction and discomfort. Arch bracing and Y-heel - Provide a customised fit and extra support, reducing in-shoe slippage. Ventilation zones - Increase airflow to create a cooler micro-climate. Fabric - 61% polyester, 23% nylon, 9% spandex, 7% Lycra.