I don’t really know the distinction between a “rash guard” and a sun hoodie but I think this is more of what I’d consider a sun hoodie and for me fits much better than the designated “sun hoodie” which I found to be too long. Anyway great piece of gear for a good price- extra points for the second zipped pocket- great feature to avoid those little things getting lost. My only quibble is the interior label is made out of a rubbery plastic that’s printed onto the fabric and feels weird and gets “stuck” a little on my skin when I’m sweating. Perhaps it will not be an issue after a few washings but seems an unnecessary thing and hopefully something easy to change for future versions of this otherwise great garment