I've never had merino wool before because of the price but we needed something warm for some high-altitude hiking. The Minus33 merino wool base layer top fits amazingly well. It is incredibly warm, very comfortable, and really feels nice on the skin, whether sweaty or not. The quality is excellent, the material is comfortably and smoothly fitting - not loose, not tight, and doesn't bind or gap anywhere. The sleeves are plenty long and the fit through the shoulders is good (I'm broad shouldered and this is sometimes problematic). I even slept in it very comfortably. it washes very well and hasn't lost its shape or fit, at least after the initial wash. I'm 5'5 and 130 lbs and the medium fit me perfectly.
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