Flip flops&;#063;

The flip flop is a synchronous bistable device,
which sounds scientific but is really quite nice,
because it fits neatly and smartly between your toes.
And it makes a great sound wherever it goes.
It allows you to stroll on the hottest of sands,
Which suits nearly all, unless you walk on your hands,
And at only ?1.50 they're within everyone's reach,
For all to enjoy in the sun on a beach?