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If you've never been surfing before, here's a quick fashion lesson: A rash guard is a top worn by itself during the summertime or even underneath a wetsuit during colder months to (three guesses as to what it does… two guesses… one…) guard from abrasion rashes caused by the surfboard. Sometimes embedded with SPF and made with breathable, quick-drying fabric, the rash guard is an indispensable piece of surfwear that is getting more fashion-forward by the season.In fact, it's so cute that we're considering wearing our own rash guards even when the only wave we're riding is a particularly bumpy subway commute. Super lightweight and free of those tell-tale signs of most athletic-wear — like zippers, sheen, and mesh — these skin-tight shirts would look (and feel) extra cool with full skirts or cut-offs, or even under blazers at work. But…are we alone in this? You probably wouldn't wear you spinning shorts out of the gym or your soccer cleats on the street, so, would you ever considering taking your rash guard off duty?