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Prevents rashes. Also if you where a regular shirt, then sometimes when grappling you can get your feet/fingers caught in someone elses, or even your own shirt, and can break it/them. I always where one.

I hate to sound like a snob but the answer is in the name bud. Rash Guard !!!

It’s main purpose is to prevent rash’s from rubbing. If you are wearing a regular T-Shirt etc when you sweat and roll around on the matt that can cause a rash. Having the licro/spandex material that breaths a little easier couple with the close fit to the body it helps in preventing rash’s…

Its to prevent you from getting mat burns when your grappling. Mat burns happen when you slide across the mat and skin comes off. Its painful and annoying so get a rash guard to stop it.

Rash guard prevent against mat burns, they help prevent against the transmission of viral and bacterial infections from other fighters, and they give you more grip with your arms and torso when you are sweaty. So a rash guard will make your arms more effective for you when applying that rear naked choke, but it will also make you arm easier for your opponent to grab for that armbar or kimura. In submission grappling tournaments a rash guard is sometimes required for these reasons. And defending chokes and grappling is why no shirts are worn in MMA, to make you more slippery and difficult to hold. Slippery sweat is one reason why the finishing techniques in MMA tend to be simple, beginners techniques, because they are easy to apply and effective, under all sorts of conditions.