Bjj rash guards are an essential article of combat clothing. A rash guard is an athletic shirt made of spandex, nylon, or polyester. The name rash guard reflects the fact that the shirt protects the wearer against rashes caused by abrasions, or by sunburns from extended exposure to the sun. These shirts can be worn by themselves, or under your BJJ gi or whatever training gear you wear. Rashguards are ideal for quick-drying, you don’t have to worry about stinking or about wearing a sweat-soaked top.BJJ and grappling sports alike spend most of the time on the mats. You’re up close and personal with your opponent rolling around for hours day by day. Your body is making contact with the floor almost entirely. There’s constant pulling, grinding, impacts, sliding, etc on the mats and that's undeniable. So obviously this has the potential to bring up some hygienic issues. BJJ rash guards are skin tight and protect your skin from microorganisms, sweat, blood, etc. Mat burn is another common thing that fighters experience and rash guards are perfect for preventing it. Rashguards are technically compression gear so they also function as such. They help to prevent muscle injury, improve blood flow, and help boost recovery times for pulled muscles.