This was my second recent order, and I bought 15 of these in several colors to replace my last batch that I bought about 15 or 20 years ago. I wear them for exterior building-repair work, and the old ones held up despite a lot of exposure to the UV radiation of the sun, plus frequent washings and the rough use of construction work. I recently bought a half dozen or so shirts to see if they are still as good as the old ones, and I tried out the newer "Hammer" line of heavy duty cotton tees, along with some long-sleeved pocket tees. These Ultra Cotton t-shirts have a slightly coarser texture than the "Hammer" line, but they also seem to have larger neck openings, which I like. One thing I like about these shirts is that they have enough length so that they don't shrink down to bare-midriff shirts like some other brands. As for size, I have about a 44 inch chest and 15 inch biceps, and after hot water washes, the XLs fit me with a comfortable degree of looseness-- not as loose as they fit on the models on the web page, but just right.
