Our square Sand Dollar Sail shade is a combination of a dome-style and sail-style shade structure. This commercial shade design uses a four-post design. Rather than a single fabric canopy, however, the design uses layered triangular sails. This style offers great visual appeal and is appreciated by customers like landscape architects. What's more, you can select multiple shade fabric colors to create a shade structure that is truly unique. This shade design is available in 20 ft. x 20 ft., 28 ft. x 28 ft., and 36 ft. x 36 ft. sizes.