Scubapro Loose Fit Rash Guard Long Sleeve - Black The perfect top for kicking around on the boat or beach loose-fitting rash guard fits nicely underneath a wetsuit and looks great when worn on its own made of water-repellant, quick-drying fabric, and it has a UV rating of UPF-51 For detailed size information, please refer to Scubapro Loose Fit & Loose Fit Channel Flow Rash Guard Sizing Guide.