Introducing the Allure Ortho 3000 Mattress from Harrison Spinks.. With layers of blended British wool and viscose, crisp cooling cotton, homegrown hemp and Sustainable Ecotex. The Allure Ortho is specifically designed for those who prefer an extra firm sleep surface. This mattress features 3000 Cortec Quad Revolution and HD Micro Springs. With an in-house woven FR chemical free mattress cover and two rows of side stitching, this mattress is turn free for your convenience. Features:. *Mattress Tension Rating: Extra Firm *Cortec Quad Revolution Springs -Offers zoned support, adjusting to your bodys movements. *HD 2000 Micro Springs -Provides additional targeted support and pressure relief. *British Wool Viscose Blend, Natural Cotton, Hemp, Sustainable Ecotex. *FR Chemical Free Wool Viscose Cover. *Turn-Free Convenience *Handcrafted Side Stitching Mattress Depth: 22cm. Available in the following sizes:. *75cm Small Single *90cm Single *120cm Small Double *135cm Double *150cm King also available as a Zip Link mattress *180cm Super King also available as a Zip Link mattress Important Information:. Please note that pocket sprung mattresses must not be used with a base for which they are not designed. Slats on a bed frame should be no less than 70mm apart, to ensure the mattress receives adequate support. Failure to use an adequate base could invalidate the warranty from the manufacturer. Please check with us for more details.