DOUROS isothermal socks that reach to the middle of the calf to keep your foot warm on cold days. The combination of isothermal & woolen yarn guarantees your best and most effective protection from the cold. The reinforced heel and toe of the sock make them more durable. They have a flat seam on the fingers so as not to bother. DOUROS SOCKS is a Greek company with 35 years of know-how that is committed to the production of high quality socks. The composition of the sock is 45% thermolan - 7% polyamide - 45% wool -3% elastan.