This sock is designed especially for good cross-country skiing trips. The sock is thick enough to insulate well, with high thermo-regulating characteristics. Keeps your feet dry and warm, even on the coldest days. – Comfort welt. – Y-heel for superior fit. – Reinforced toe and heel. – Anatomically shaped for right and left foot. – Instep protector. Supreme wool comfort: Insulation and temperature regulation. Elastic all over for perfect fitting.