Merino wool is one of the most popular wool yarns in the world. It comes from merino sheep, which is a 100% natural, biodegradable and recyclable fiber. In addition to its softness, merino wool is also hypoallergenic, i.e. non-irritating! You do not need to wash merino wool as often because its natural properties remove dirt, do not absorb odors and thus prevent bacterial and microbial growth.