This is a really nice heavyweight t shirt. It’s similar to Whitesville’s heavyweight l/s t shirt, though slightly lighter weight with much more give. I really like that it’s has some give, which I assume has to do with the how the yarn is spun, similar to a Jaspé t shirt from J Crew I had years ago.
As for fit, it’s much closer to US sizing than Asian. I’m 5’8”/147 and bought my normal size, Small, and it fits well. The neck is a little snug for my liking, but not as bad as my Non Stock gussete...