I knew what size to order from trying on someone else's of the same brand. For clothes I normally wear mediums, so I'm glad I tried one on or I would have gotten the wrong size. It keeps me so much warmer in the water.

I usally wear a small in just about everything, so I ordered a medium and it was still too tight around the chest area.

The body fits great, but the neck is too tight.
I love the style and the color

The rash guard is great overall, but does run smaller than typical shirts due to the nature of the garmet. My suggestion is to buy one size bigger.

We had ordered a medium and it was way too small...ordered it again as a large and it worked fine.

This did not work for me at all. For a shirt it ran really small and I am a regular medium. I ordered one for my husband, (size XL) and he decided not to try it. I don't care for logos across my chest but will tolerate it for a good fit. The search continues..