A vinyl encapsulated polyester mesh material, FloFlex Upholstery System lasts longer than most wheelchair seat upholstery. The unique mesh is strong, flexible, and provides comfort without trapping heat. Upholstery can easily be cleaned with soap and water and is ultraviolet ray and mildew resistant. Invacare/Drive style. Fits chairs with 3 5/8" center bolt pattern. Choose 16'W x 16"D, 18'W x 16"D, or 20'W x 16"D. Hardware included. Sold as each.