The Vogue Ortho Caress 1500 Pocket Sprung Super King Size Mattress is a luxury foam encapsulated mattress with wool & polyester fillings that work together to give superior comfort. Heat treated pocket springs that work individually each in their own fabric pocket for quality support. Air vents also let the mattress breathe when you sleep stopping humidity building & absorbing moisture providing a relaxing sleep. Can also be used on wooden & metal bed frames.