This shirt immediately became my go-to shirt, and I'm back to order more! It's soft and lovely to wear, with a flattering fit so I feel that I can go running/biking or to the store just as easily. I have horses, and usually the cushy, comfy shirts that I want to wear attract hay, dog hair, etc. This shirt does not. It also doesn't look crumpled easily, and washes well. I'd say it fits true to size...I was wavering between small and med and am glad I got the small. The arms are long enough (and I have long arms). The sleeves fit snugly so if I had huge biceps I might size up, but for me they are perfect. Can't recommend this shirt highly enough!
I own several of these and I noticed this year the fabric is thinner than previous seasons (negative). I own a large which fits well with a tight layer underneath. Sometimes the sizing from Mountain Hardware is off. This year's large is longer than last year's which is a good thing. But overall this is a really comfortable shirt, I knocked it because the price is the same for less shirt.