Technology. *Two layer hand-nested calico pocket spring construction *Springs diameter: 62mm *2,030 springs in 150 x 200cm size 5ft x 6ft 6in Upholstery. *Exclusive natural fillings: Platinum Certified British fleece wool, hand-teased horsetail blended with Devonshire wool, Platinum Certified British fleece wool *Finest quality ticking *Hand tufted with felt washers Borders. *Upholstered with protective wool *3 rows of hand side-stitching *Horizontal handles *Air vents *Depth: 23cm All Vispring Mattresses come with a 30 Year Guarantee. .