It's super-fine and soft. A single Merino wool fiber is ⅓ the diameter of a human hair. It's so fine, actually, that when it brushes up against skin, it bends out of the way. It can't be prickly like other wool fibers because it can't stand up to the weight of itself.

Greater Temperature and Moisture Control The fine fibers from merino sheep breeds offer unparalleled breathability and manage moisture very effectively, so you're never left feeling too clammy or hot. Traditional, coarse wool would feel warmer than merino wool in hot weather because it lacks these qualities.

Assuming the wool was grown and processed carefully, then yes, 100% Merino Wool yarns are excellent quality. These yarns harness all the amazing benefits of Merino Wool, from regulating temperature to wicking moisture.

Merino, breed of fine-wool sheep originating in Spain; it was known as early as the 12th century and may have been a Moorish importation. It was particularly well adapted to semiarid climates and to nomadic pasturing. The breed has become prominent in many countries worldwide.