Merino wool is a unique variant of wool that offers unique performance benefits not seen in other types of wool. Specifically, merino wool has a natural antibacterial property that helps to prevent odors from forming. Likewise, even when wet (or damp from foot sweat) this type of wool is able to easily retain heat — making them ideal as an insulator. At the same time, these types of socks are also naturally breathable, which also makes them great for use in warmer weather as long as you pick the right weight.