These sealskinz trekking socks are a thick calf length sock with a padded lining of merino wool loop pile for exceptional thermal and wicking performances developed specifically for trekking and hiking in cold wet weather all sealskinz socks incorporate unique seamless close fitting three layer technology which reduces friction between the foot and shoe providing in built blister reduction the close fitting inner actively wicks sweat and moisture away from the skinthe waterproof highly b