Milly and Molly are a set of identical twin eight-year-old sisters who love swimming. Milly always wears a blue long-sleeved rashie with flowers all over it, a pair of cyan long-sleeved togs with clouds on them, a pair of sapphire blue non-fogging swimming goggles, a pair of light blue rubber gloves, a pair of cobalt blue nose clips, a navy blue swimming cap, a pair of light blue swimming socks and a pair of blue swimming shoes. Molly always wears a pink long-sleeved full-body tight-fitting rubber wetsuit with yellow stars all over it, a pair of pink non-fogging swimming goggles, a pair of pink rubber gloves, a pair of pink nose-clips, a pink swimming cap, a pair of pink swimming socks and a pair of pink swimming shoes. The twins love to use their imaginations and do pretend adventures in their pool. Both of them have very good breath-holding skills.