First the size - I'm 6'3" 215 and the xxl fits well.  I'd say I'm typically an XL, and the xxl fits just fine.  It's not loose anywhere, though the chest doesn't "cling" as much as other areas.  It still fitted though - just not as much as other areas. It gives me plenty of length - this coming from a pretty long torsoed person.  The material is similar to an under armour shirt - it's soft and smooth.  It is very comfortable to wear.  While I haven't yet, I can imagine wearing this for a whole day without getting uncomfortable.

I'm annoyed that the logo had no blue color in it.  It was just black and gray.  The photo for the white shirt shows the logo blue - I was hoping for this.  This is the ONLY reason I'm not giving it 5 stars.

Other than that, this is a great rash guard and men 6'3" 215 can order a xxl with confidence!