For a more comfortable night's sleep, the unique eggcrate design gently massages the whole body and soothes pressure points while you sleep.Deluxe, low-density, foam mattress overlay. 4cm depth. Brings back the bounce factor in your mattress and provides maximum therapeutic support from head to toe.Can be used with the slab side up for smooth finish or down to get the benefit of the massaging qualities of the eggcrate texture.Treated foam controls mildew, bacteria, mould and dust mites.Clean with a damp cloth. Keep out of contact with heat or direct sunlight. Range includes 5 sizes: S, KS, D, Q & K.NB: This product should not be used in conjunction with an electric blanket.