Fits tactical boot socks are the ultimate combination of performance and durability. Made with a 100% Merino wool layer against your skin, Fits boot socks will keep your feet dry and comfortable during even extended wear while you do the toughest of field work. The outside layer is made of tougher stuff. Heavy-duty nylon stands guard against wear and tear, giving Fits socks the durability you need. No other heavyweight sock can compare to Fits tactical socks.