MP Michael Phelps X-O RACE CAP Black/Yellow Small MP Michael Phelps X-O RACE CAP Black/Yellow Small MP Michael Phelps X-O RACE CAP Black/Yellow Small MP Michael Phelps X-O RACE CAP Black/Yellow Small MP Michael Phelps X-O RACE CAP Black/Yellow Small MP Michael Phelps X-O RACE CAP Black/Yellow Small MP Michael Phelps X-O RACE CAP Black/Yellow Small MP Michael Phelps X-O RACE CAP Black/Yellow Small MP Michael Phelps X-O RACE CAP Black/Yellow Small MP Michael Phelps X-O RACE CAP Black/Yellow Small MP Michael Phelps X-O RACE CAP Black/Yellow Small MP Michael Phelps X-O RACE CAP Black/Yellow Small The X-O Competition Swim Cap's unique streamlined deisgn combines strategically placed, dual density panels with differing levels of thickness and rigidity to provide a hydrodynamic shape and ensure a perfect 360 degree fit.