Single-reverse cube: Individual sides sewn together, 3 bottom edges finished with hook-and-loop fastener to enclose foam cube
Single-reverse quarter-ring: Individual sides sewn together, one side finished with hook-and-loop fastener on 3 edges (sides and bottom) to enclose foam element
Single-reverse wedge: Individual sides sewn together, 2 sides on the bottom finished with hook-and-loop fastener to enclose foam wedge