I fall between a small and medium and if you’re in a similar boat between sizes, I’d go with your larger size for a snug, fitted base layer. But if you prefer a looser, more relaxed look, don’t be afraid to go up even further. I typically wear a vest over mine, which makes the medium work perfectly for that layered look in the meantime — but I’m already eyeing the large for when it’s back in stock.
The real win is temperature regulation. I tend to run cold but overheat easily when active — and this shirt handles both ends beautifully. When I slow down it keeps me comfortable, and when work picks up and I’m pushing, squatting, and lifting, it keeps me comfortable too. It’s substantial enough to feel like a proper layer without trapping heat, and the merino does exactly what it promises: I stay fresh for 2–3 wears between washes without any issues.
A few other things I really appreciated: it’s completely opaque — no thinking twice about what you’re wearing underneath — and the length is genuinely flattering. Not cropped, not weirdly long. It just sits right.
The fabric has a lovely natural stretch that helps it hold its shape without bagging out over time. I’ve had zero issues with pilling or shrinkage, which I credit partly to treating it right: I use Nikwax wool wash, do wool-only loads, and never put it in the dryer. If you’re investing in merino, it’s worth the small extra care.
I got mine in black, which looks polished and substantial — not thin or cheap.
I came to merino because I was done with synthetic fabrics that trap heat and hold odor. This is everything I wanted.