I've been looking for a decent black t-shirt for work, one that doesn't shrink, isn't too light or too heavy, is long enough to tuck in when necessary, (I'm 6'1" 225lbs), or leave untucked as I prefer.

I ordered size XL though I was worried it might shrink and therefore no longer be long enough to wear (assumming the XL would be long enough in the first place...it was), or even too tight, and that I probably should have ordered size 2XL.  Turns out size XL is perfect, it was a little tight at first (I'll admit I should do a few situps), but after wearing and washing them, (in cold water only)a couple times they fit perfectly.  They ARE slightly heavier than I would have liked (I'm constantly active during my work shift and it can get a little hot sometimes wearing these t-shirts under a required uniform dress shirt, even when both are untucked and the dress shirt unbuttoned.)  Other than that, I can't find a thing wrong with them.  The price is great, the shipping outstanding (free for me w/ prime).  I'm ordering a few more right now.