Introducing the POLAR crew sock. Made with soft Merino wool fibers keep you itch-free while drawing moisture away from your skin. The heavyweight knit cushions your foot on even your toughest treks. Fully thermal lined construction insulates and absorbs shock. Spandex compression arch adds support and prevents sagging. Support at the arch helps fight fatigue and keep sock in place while the reinforced heel & toe areas increase overall durability. Case in point: a great heavyweight, cold weather sock to add to your arsenal.