This is my second Phalanx rash guard, only difference is this one is long sleeves. I am 5'9" 170lb (40R in standard suit sizing) and the large is the correct fit for me. Fit and performance are outstanding. The material is thicker than other rash guards I own and this is a GOOD thing. We all know that some newbie is going to grab your rash guard and potentially destroy it since they do not know any better. The weight of this garment resists the possibility of damage from said newbies that think it is a GI. Lastly, when the instructor comments on the amazing look of this rash guard, that is two-thumbs UP.
Again with the quality I’ve come to expect in my training gear! Never cease to amaze with the quality, fit, comfort, and customer service!