Sealskinz water proof trecking socks developed specifically for hiking in more arduous conditions, Trecking sock has a padded loop piled layer of merino wool for the toes, sole, heel & archilles area to give extra protection, comfort & support. . The extended length provides additioanal protection up to the calf. . Full calf length . Close fitting & seamless . Loop pilemerino wool for ytoes, sole, heel & Achiles area . 100% waterproof, breatble & windproof membrane