Abstract: a foldable, portable solar tanning box of sun reflective fabric having a floor comprising plural hingedly connected floor panels, and end walls and side walls, all hingedly connected to the floor. Cooperating fasteners are secured to each of the end walls and adjacent portions of the side walls for holding the side and end walls in the erected position. The fasteners on each of the end walls cooperate with each other to hold the box in the folded position. By this construction and arrangement, the fasteners on the end walls are employed for not only holding the box in the erected position but also for holding the box in the folded position.