Features our unique T3 contruction with maximum cushioning for protection and warmth. The combination of Merino Wool and PrimaLoft® Yarn results in faster drying and wicking than just Merino Wool while still maintaining a comfortable feel against the skin. Best suited for cold or damp weather hikes where moisture is an issue. Primaloft® Yarn is made up of ultra-fine polyester fibers 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® fibers wick moisture away from the skin and trap body heat. This is a fantastic sock for hikers looking who need warmth, padding, and dryness.