Lattice Stitch Step-Up SeatThe seat combines a Gel-Core interior and Ultra-Foam that creates a foam that is a perfect balance of rigidity and user compliance Ultra-Foam unique molding process creates an element-resistant self-skinning process that seals the foam from water and enhances the seat's durability as well as comfort Lattice stitch (LS) retro styling infuses the old school spirit with a modern day twist Designed and made in the USA 4-3/4" (12.07 cm) lumbar support.