Frame constructions have been rigorously tested to simulate the home and transportation environments for improved durability. Components are secured with combinations of glue, blocks, interlocking panels and staples. Seats and back spring rails are cut from mixed hardwood and engineered lumber. Stripes and patterns are match cut. All fabrics are pre-approved for wearability and durability against AHFA standards. Reversible Coil Seating features individually pocketed coils to create uniformed shape and consistent support for durable seating comfort.