The Seal Skinz Trekking Thick Mid Socks are thick-weight waterproof windproof & breathable making them ideal for keeping your feet dry warm & comfortable when added insulation is needed on a wonderful hike in the colder months These waterproof socks have a durable outer & an extra thick merino wool lining for moisture control & comfort they also have a well elasticated ankle & instep & a Y-gore heel construction for excellent support & a great secure fit This thick-weight sock also has a padded heel toe & footbed to help absorb shock & guard against pressure & friction to reduce the risk of blisters making them a fantastic warmer pair of waterproof socks ideal for protecting your feet this winter