The Lorpen T3 Womens Midweight Hiker Shorty Socks is a hiking sock designed to keep your feet warm and dry while providing a performance enhancing experience in extreme environments This sock combines layers of technical fibres Primaloft reg Eco Polyester Yarn and Merino Wool The inner layer of Primaloft reg Eco Polyester Yarn is made up of ultra-fine polyester fibres which are finer than cashmere resulting in a luxuriously soft feel while providing unparalleled moisture wicking When hiking climbing or doing any aerobic activity your body works up a sweat and emits heat and perspiration but when you suddenly sit idle you can easily start to freeze with an insulation that absorbs water Primaloft reg Eco Polyester Yarn fibres wick moisture away from the skin and trap body heat Merino Wool provides all-day warmth while wicking moisture away from the foot to keep you dry Knit with heavy cushioning all throughout the sock for warmth and a snug fit within your boots that prevents irritation from the inner boot liner