Keep your booty-game 100 with the RVCA Shapeshifter Medium Bikini Bottoms! Despite their name, the Shapeshifter Bottoms offer a secure fit and don't shift around while swimming or on the move. Complete with flattering inset foam and quilting details at the front and back side seams, the RVCA Shapeshifter Medium Bikini Bottoms are mid-coverage magicians.