The william mattress features 1000 independently pocketed springs which shapes to the contours of your body for support additional layers of white fibre and resilient foam provide softness and comfort for a peaceful sleepplease note spring count refers to a 5ft kingsize modeldimensions single w 90cm x l 190cm double w 135cm x l 190cm kingsize w 150cm x l 200cm superking w 180cm x l 200cm depth 29cm