It's is a basic t-shirt. Now that I've received it, I'm honestly very happy with it. It fits me nicely and is very soft. Its a bit summer-time thin, but not in a bad way. It is not tight in my shoulders as is sometimes the case for me and cap sleeves, so that is great.
For reference, B 36", W 29", H 37" 150lbs, 5'5" and I ordered a medium.