Wool sock trekk is a thicker wool sock. The perfect choice as the wool regulates heat. Warms when it's cold and breathes when it's hot. Wool socks with terry sole for Hiking and Trekking, extra reinforcement on the heel and toe, stretch in the arch of the foot and over the ankle. Thin upper with knitted ventilation channels. Wool Sock Trekk is more suitable for hiking, a durable sock.