Rain flies that have lost their waterproofness can also be replaced with less cost than is required to buy a new single-walled tent. Think pup tent with corner stakes. The steep pitch of the walls interferes with headroom, but these tents are nice because of their simple design. Modified A-frames incorporate a curved ridge pole for more efficient use of interior space. Buckminster Fuller applied principles of the geodesic dome to buildings, but the design is even more popular in tents.
Poles criss-cross over the top, producing a hexagonal, octagonal or similar geometrical shape.
These tents are free standing. However they can blow away like a tumbleweed if not properly staked. The geometrical shapes provide maximum headroom, although the floor plan isn't as efficient as the standard A-frame rectangle for sleeping. These tents aren't as rugged in highwinds, rain and snow as A-frames or Domes, but their shape is highly efficient for both weight and floor space. Hoop tents generally incorporate three arched frame stays, which allow for nice, roomy doors and high ceilings.