No.?3 introduces Pillow Top. It s an extra layer of memory woolthat s added to the mattress surface for an incredible depthof comfort. Beneath that, No.?3 holds 1400 pocketed springsand is filled with even more natural materials cotton, wool, soft bamboo, fleecy alpaca and silky pashmina. Elsewhere, the hand-tufted filling keeps the mattress at its best andwe add further layers of wool for even more comfort. It s allfinished with Belgian Damask ticking that gives the mattresssurface an incredibly silky feel.