Drymax Work Boot Socks have a special Dual Layer Moisture Removal System. This system instantly moves moisture from the skin, through the inner Drymax layer to the outer absorbent layer, keeping the feet dry. This is the same system used to keep marathon runners' feet dry for 26.2 miles. The Work Boot sock is a high density protective padded sock. Using dense padding, as opposed to thick padding, protects feet without adversely affecting the fit of the boots. The Work Boot Socks are designed for use in cold to hot conditions, keeping feet dry, comfortable and odor free all day long. 50% olefin / 35% polyester / 7% elastane/ 8% nylon.