With layers of blended British wool and viscose, a British wool, hemp and flax blend, a cotton, hemp and flax blend and Sustainable Ecotex. The Gold 9500 mattress features 9,500 of our award-winning springs, including Cortec™ Quad Revolution® spring system, contouring HD 2,500 and HD 3,000 Micro springs and Posturfil Pocket springs. With an in-house woven FR chemical treatment free mattress cover and three rows of side stitching, this mattress is turn free for your convenience.