The Birmingham mattress from Simmons Beautyrest, offers value and supreme comfort. Plush firm PurFoam™ Plush Energy Foam™, part of Simmons' patented no-flip construction Coil unit: 464 Series 8" (.083) The Triton foundation reduces motion across the mattress and provides unparalleled durability Simmons Beautyrest Classic Birmingham Twin Mattress Set 10 year non-prorated warranty. Image shown is Queen Size Mattress Set.