Sweat, pressure points, and shearing forces can lead to blisters. Your socks are your first line of defense against these enemies. They must fit correctly so they don't bunch up and lead to pressure and shearing forces. They must wick sweat away from your skin. Forget cotton socks. Forget tube socks. Invest in wicking, anatomically designed walking socks and your feet will thank you. More From Walking.about.com