The Rochingham Ultimate Cassette Cot Mattress is aluxury casette sprung baby mattress, offering comfort & support for your baby. The cassette spring is a collection of independently encased springs, which is a system that promotes a natural sleeping position ans spinal support for a growing child. The luxury foam surround provides added posture control. The quilted mattress cover is air permeable, water resistant & featuresa taped edge. There is an adjustable waterproof membrane inline with the nappy area.