Abstract: A portable chair includes an undulating wave-shaped body. The undulating wave-shaped body has a convex lower portion which transitions into a concave mid-section, which in turn transitions into a convex upper portion. The chair further includes a support leg pivotally attached to the body and being movable between a closed position for storage and carrying and an open position for seating. The support leg is concave shaped to substantially conform to the shape of the concave mid-section of the body when in the closed position.