No. 4 is our most responsive mattress. It’s made with 1600 honeycombed pocket springs and 1500 micro springs for the most comfortable night’s sleep. We hand fill the mattress with pure new wool and cotton. Then we add Pillow Top – an extra layer that sits on the mattress surface for even more enveloping comfort. It’s filled with the finest natural materials – pashmina, soft bamboo, alpaca, cashmere and silk. Underneath that you’ll find further layers of wool that are all hand-tufted to make sure the mattress keeps its shape over time. It’s finished with Belgian Damask ticking to create a feather-soft surface wherever you lie down.