I like Patagonia products for their functionality and flair and this capilene zip neck top is all of that. The two tone contrast on the mango shirt is subtle and the shirt would pass for a semi-dressy in a pinch. Size Medium fits well and I consider myself between small and medium @ 38" chest, long torso and 32" arms, athletic build. I have since purchased 4 merino wool shirts by another fine maker, Stoic and in comparison to this polypropylene Capilene top, the merino wool is a hands down winner in the "no odor retention" category. Polypro, on my body is definitely a "one day" affair.....merino wool hangs in there for 3 days or more and I'm still acceptable to be around. Also, merino wool products wick moisture from the arm pit area, a nice feature whichever manufacturer you choose.