The Vogue Ortho Caress 1500 Small Single Pocket Sprung Mattress with upto 1500 pocket springs that work individually each in their own fabric pocket conforming to the natural shape of the body for the very best in support. luxurious layers of wool & polyester fillings that work together for superior comfort. Air vents to let the mattress breathe while you sleep stopping humidity building. This mattress is also ideal for many bed base types.