This is a truly excellent product for anyone who appreciates wool for the outdoors. Much higher quality than similar products I have tried. Breathable, very warm, and probably overkill for outside temps above freezing, although wool adapts well. The knitted wool is thick and heavy for a base layer but is slightly coarser than merino. It also works as a mid-layer over a thin base if itching or scratchiness is a problem, although it feels fine to me. It's hard to find products like this these days, but there is reason it is still around after so many years. Not cheap but worth the price and made to last. Good job, Stanfield! For reference, I am 5'10" 180lbs and a large fits well.