To create its opulent levels of comfort, the Imperial mattress comprises of naturally resilient horsehair and bamboo sandwiched between layers of bonded and blended platinum certified British fleece wool. At the core of this Vi-Spring mattress sits over a thousand hand-nested calico pocketed springs, therefore minimises roll together if sleeping with a partner, providing independent support. The Imperial relies on three rows of genuine hand side-stitching that bonds the body to the spring unit giving the mattress a naturally supportive and resilient structure.