The Chicago has 3000 individually nested pocket springs in three layers offering comfort, support and pressure relief for all shapes and sizes. Key fillings: wool, cashmere and cotton. Pure new wool for comfort and to absorb moisture from the surroundings and stop fungal growth. Cashmere is fur of the Kashmir goat it is soft luxurious feel and rich lustre combine with great durability. Cotton is the most widely used natural fibre for its softness and breath ability. It also feels comfortable to keep you warm in winter & cool in summer. This is the height of mattress luxury.