I needed lightweight long sleeve large roomy shirts for hiking (long enough to cover my behind) and these do the trick well enough. I thought I wanted cotton, but the 50/50 blend and the light weight really works much better than my heavy cotton shirts which just get heavy with sweat as opposed to these shirts which are light enough to dry as I hike.
My one gripe is that of the 4 shirts I bought, THREE of them sprung a hole in the same place - the seam on the arm right by the cuff. The seam came open and on one of the unraveled so that the whole cuff came off. I put a few stitches on the seam near the cuff on the others and they've been fine.