Love these. Fit true to size for me (medium). Breathable and launder well.

Maybe I might be biased since I'm petite, but these fit true to size for me. They're much easier to keep clean than the other shirts (most stains wash right out without having to pre-treat). They're breathable and dry fast. I knocked off a star because even though the material is opaque, you can still easily see the outline of whatever base layer/undergarments are worn underneath.

One size up is enough.

Buy 2 sizes bigger. If you're M then XL will be good for you.

You need to buy to size up they run very small