This fully breathable foam nursery mattress has a water-resistant, removable, hypo-allergenic cover that is machine washable. The dent resistant nursery foam has an open top structure which allows for good air movement and heat dissipation. This mattress is supportive and comfortable. Meets current British Standards. Hypo-allergenic cover offers protection against dust mites, which causes eczema and asthma. Cover is removable & washable at 60oc. Dent resistant baby safe foam core, the cover is water resistant, yet breathable and machine washable. Perfect for baby to be placed in the feet to foot position as recommended by the lullaby trust. Hypoallergenic. Core material foam. Cover: 100% polypropylene, . Removable washable cover. General information:Size L116, W83, D5cm.