Designed to give your mattress an extra layer of luxury, for even greater comfort and softness. Exclusive to Somnus; the Herdwick Wool Luxury Mattress Enhancer can attach to any Somnus mattress. Generously filled with the finest natural cotton, Herdwick Eco wool and British Eco wool, working in harmony with Somnus’s pioneering Sensa Intelligent springs. Handmade to order to any size and dual sided for ease of turning, just flip your enhancer to refresh the sleeping surface.