SealSkinz Waterproof Trekking Sock: Developed specifically for hiking in arduous conditions it has a padded loop pile layer of Merino wool in key areas, it is full calf length. These socks are Windproof, Waterproof, Breathable and can be used in many conditions including:- Fishing, Outdoor Activities, Horse Riding, Hiking and ideal for making the Military boot a little more comfortable.