So, I bought this with hopes of wearing it as a single layer for summertime runs (I prefer long sleeve, mock-neck shirts to minimize daily sun exposure).What I found was:- it's much thicker than I expected. I wore it this morning for my run, in 37 degrees, and it kept me plenty warm (with nothing else underneath).- the mock-neck is just a tad too high. When fully zipped I have to hold my chin high or my chin rubs on the zipper/neckline.- the zipper is not lined underneath, so again, when fully zipped, the zipper rubs on my chest. I had to unzip it a bit to relieve the rubbing.It's absolutely a durable and functional top, but for me it will have to be worn as a layering piece only. It won't work as a stand-alone running shirt, and most definitely will be too warm for the summer.Sizing: I am 5' 4, 130lbs, 36 B/C cup, and the small looks very flattering and fitted, yet has plenty of loose wrinkles and will absolutely accommodate an undershirt.
Rating: [4 of 5 Stars!]