A thin shirt made out of a stretchy material worn by surfers. It is worn on the upper body to protect from reef rash.
Brian wore a Rash Guard after that big hit he took last month and tore up his back.
Lycra tight fitting surf shirt that protects surfer's stomachs, backs and upper body from rash that comes from rubbing up against surfboards.
"Dude i'm so glad i wore my rashguard! Did you see that crazy ass Kevin's bleeding raw stomach?! He should have worn a rashguard."