I'm 5'9"female at 156 lb I want to use the shirt under my wetsuit or instead it. Do I need the M or the S size?
I would think the M would be a better fit. It is not an overly tight fit but is "snug". I don't think you will find it warm enough to be in place of a wetsuit but under it is great. Also works well for snorkeling in 75 degree water give or take depending on your own comfort levels. Dries fast and is nice as a surface interval garment.
My experience as a 5'10" male at 165 lb was that the medium was too lose but the small just right. I started with the M but as it didn't fit to my satisfaction the great LP customer service returned it and sent the S at no cost to me. I'd suggest start with the S as you need the shirt to be snug.
I would get the medium, they fit tight
Most all rash guards I own have been smaller than their designated size would imply -- EXCEPT this one.
I actually had to send my XXL back for a smaller size because it literally wore like an over-sized T-Shirt. Though it is a rash guard, it does appear designed/shaped/sized for more use than just underwater scuba/snorkeling.
So I'd favor the S over the M. IMHO.
It is a good looking rash guard, regardless.
I am 6'2" 210 and I have the XL. It is tight. If you are lagre chested you will want the M as it is tight accross the chest.
my wife says " i'd go m, they run true to size"
They run a bit big.
If you prefer a tighter fit, get a size smaller.
Great rash guard.
I have worn the Nat Geo shirt while snorkeling and it worked fine, but it doesn't offer any isnulation so I woudln't wear it inplace of a wetsuit when diving
Bought this as a gift for a woman about your size and bought a large.
I found the sizing to run small....where I normally wore a lg I needed xl fo the full wet suit....I would suggest the m ....but the good thing is they have a great exchange department at Leisure Pro.......
We got the size large. My wife is about the same size as you and when she put it on it fit her very loose, like a night shirt. So, we would guess the medium would be about right. Unless you want it tighter to your body.
I am a 5'10" male at 180 lbs. I bought the L and it is not skin-tight like most rash guards I've had. This is great for ease of putting on/taking off. The M might be a little roomy on you but unless you like struggling, I don't think a S would be as comfortable. A little extra fabric might leave a crease or two on your skin under a wetsuit after a dive but, hey, who cares?
For a good fit, I think that you would need a medium.