All 6 standard UK Mattress Sizes Available: 2ft6 Small Single, 3ft Single, 4ft Small Double, 4ft6 Double, 5ft UK King, 6ft Super King. Orthopaedic mattress with a medium-firm tension, a special firm spring unit is used to maximise the support. Classic fillings provide a comfortable and soft sleep surface. The cover is made from fine Belgian Damask fabric. Hand tufted for increased durability. Can be rotated for longevity. The Ortho Nebula Orthopaedic Spring Mattress is handmade in the UK, exclusively for Sleep Factory Ltd conforming to the British standards and is fire retardant