I am 5'11, and weigh 165 lbs, you can see my predicament with the Body Glove size chart.

http://bodyglove.com/help_size.html

l have an L, and an LS. The L is def big on me (but still works), and the LS l feel is pretty good, but still unsure if it is perfect for me.

Brain = Barbarian. U do not have to try bout size. U just tell them gorila size, then they will bring for u.. :) Have a nice day !~ Cheers !~

Not sure how old you are and how much growing you have left but at this moment, the MT would probably be your best bet since you sound like a pretty skinny dude. If you are still growing a bit, I'd go for the L to give you some room to fill it out.

You can always choose another manufacturer. You want the suit to fit like a second skin, but still be flexible enough to move freely. Try the suits on at a surf shop before you pay out the bucks. Your best best of getting the perfect fit, is to try different brands.

medium.

you're only bigger than me by an inch and five pounds.

Try a MT then. l am 5'8'' 165 and wear a Med so a MT might be the ticket. If BG does not have the right fit for you change brands.

Surfammo is dead on. Do exactly what he says.

l agree with john f. kim dude is right

Hmm, Im used to women is size charts, but l do know if your in a really weird in between size, you can always get a custom suit made, but l do think these usually cost a bit extra!