With layers of blended British wool and viscose, a British wool blend, a cotton, hemp and flax blend and Sustainable Ecotex. The Radiant pillowtop mattress features 15,000 of our award-winning springs, including Cortec™ Quad Revolution® spring system and contouring HD 2,000, HD 3,000 and HD 4,000 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.