With layers of blended British wool and viscose , crisp cooling cotton, British wool, a British wool and mohair blend and Sustainable Ecotex. The Iona Ortho is specifically designed for those who prefer an extra firm sleep surface. This mattress features 10500 Cortec™ Quad Revolution and HD Micro Springs. With a woven FR chemical free mattress cover and three rows of side stitching, this mattress is turn free for your convenience. Available as 2'6", 3', 4', 4'6", 5', and 6' sizes, with or without drawers, and as mattress only options.