This zip & link mattress features an award winning Revolution Pocket Spring System. Layered with Posturfil springs close to the sleeping surface offering responsive support with natural wool & cotton blend surface fillings for excellent comfort. Available in tensions 4 (soft) to 8 (firm) Only available in King or Super King 2 rows of side stitching for edge-to-edge support No need to turn Fillings Revolution pocket springs Posturfill springs Hempure fibres British wool & cotton blend surface fillings We offer a wider range of mattresses in store where you can be fitted for the right mattress by our trained sleep experts.