With layers of blended British wool and viscose, a British wool blend, a cotton, hemp and flax blend and Sustainable Ecotex. The Asscher pillowtop mattress features 11,000 of our award-winning springs, including Cortec™ Quad Revolution® spring system and contouring HD 2000, HD 3000 and HD 4000 Micro spring. With an in-house woven FR chemical treatment free mattress cover and two rows of side stitching, this mattress is turn-free for your convenience.