1" High-Density Foam Pad: HH Perkins' 1" High-Density Foam Pad measures 18" x 18" and is one inch thick. Foam Pads can easily be cut to fit the size your project requires. Used to provide comfort for Shaker Tape, Splint, and binder Cane seats. 1" Foam Pads are used in upholstery and for seat cushions.