From our contract collection the source 5 crib 5 kingfisher waterproof mattress features a traditional and durable open coil spring system and breathable pvc coated waterproof panelsat its core is a spring system made up of rows of hourglass shaped springs connected into one single unit with a thick rodedge wire adding support to the perimeter of the mattress for an extra level of hygiene its cover can be easily cleaned with antibacterial cleaning agents reducing the risk of bacterial and funga