I wasn't sure what was meant by 'swim sarong' but now I get it - this sarong can be used to cover up when dry or wet, it's easily worn in the water & dries really quickly!
I used to hate walking down the beach in a bathing suit with my backside hanging out, but love that now I can walk down the beach and straight into the water wearing this sarong, then it's almost dry by the time I reach my towel, love it!!