The Kozeesleep Richmond mattress is ideal for children. It has a durable 13 gauge Open coil spring system with a stitchbond cover. The mattress surface is micro-quilted & the resilient white fibre fillings will help to retain the shape & integrity of the mattress. 5.6" (14cm) deep 13 gauge open coil spring unit reinforced with 9 gauge steel rod frame medium support microquilted stitchbond cover