Fits snug but not contricting.  Very comfortable to swim in.  Used it recently when the pool temp was 72 and this shirt helped make gt thru the swim workout with out the shivers.

felt very tight at first, neck a little too tight, but felt ok in water.  wasn't as cold as I would have been without it.  liked that no water got under it as I was in water.  liked material

I bought this to swim outdoor to avoid getting rash and sunburn.  It works great and fits me well.