SealSkinz Thick Weight Trekking Sock Part of the new range of Sealskinz waterproof socks, an improved design and better fitting sock, this sock has been developed specifically for trekking and hiking in more arduous conditions. Similar to the Thick Mid Length Sock but with olive trim and designed for the Outdoor market. Merino wool inner gives exceptional thermal and wicking performance. Deep padded loop pile around toes, sole, heel and achilles provide extra protection. Elasticated arch and ankle provide support and ensure a close, comfortable fit, with minimal friction within the shoe.