Very cool design, I’ve only worn it once to training so far, but got a lot of positive comments on it. As someone who trains BJJ and also has a chemistry degree this was pretty much a no-brainer for me.That said the rash guard is probably the thinnest I own, and I own probably 30. It is comfortable and does the job, but a little bit thicker and maybe with the grip at the bottom and on the sleeves would be better. Overall, a cool product though and would buy again.