These moisture wicking liner socks add comfort and extra warmth that feels great all day long. They are super thin and wear flat, so they are perfect for layering in combination with heavier weight socks on chilly days without cramping or bunching inside your boots. When used with another pair of socks in warmer or wet weather, they will keep your feet drier by adding an extra wicking layer. These are super-comfortable, pack in nano-space, and dry out fast after being washed in a motel bathroom sink. M(5–8.5), L(9–12), XL(13–15).