Abstract: Foldable and portable shelter structure constructed from a rigid or semi-rigid, thin material such as cardboard, plastic, and the like, formed of a pair of hexagons, placed face-to-face and secured to each other, as by taping, along two or three of the contiguous outer edges of the hexagons. According to one embodiment, each hexagon is divided into six triangles, and the lines which separate these triangles are each flexible in one direction. The pair of hexagons can be pulled apart like a "party hat" and placed on a flat surface to form a standing shelter structure. A floor can be added as an integral part of the structure, which is at full strength when set up flat on the ground.