An article of footwear includes a sole and an upper connected to the sole. The upper and the sole form a foot cavity with an insole positioned within the foot cavity. The upper further includes a heel cup defining a posterior heel wall and an elastic heel strap that extends around an exterior surface of the posterior heel wall. The heel cup is configured to be moved between an upright position and a folded position, wherein the posterior heel wall is adjacent to the elastic heel strap when the heel cup is in the upright position, and the posterior heel wall is removed from the elastic heel strap and is laid against the insole when the heel cup is in the folded position.