Rash vest, rash guard or rashie whatever you call it they are all the same thing. Made to protect you from rashes as simple as that, whether it is from paddling out on a surf board or wearing it under a wetsuit to keep you comfortable. Many rash vests protect you from harmful UV rays up to SPF50. These are made to be light, quick drying and durable, 6 panel construction makes them more comfortable than traditional design.