High - tech materials - provided by nature
No sythetic fibers can match Wool
The fibers from Merino wool are much finer than other types of wool and synthetic fibers. This means that for a given weight Merino contains more air spaces. More air spaces = more insulation. That's why Merino is better at keeping the cold out and the warmth in. In addition, the natural crimp (waviness) of Merino fibers creates millions of tiny air spaces. More insulation = better thermal comfort. Other fibers, lacking Merino's crimp, aren't able to generate further insulation in this way.