. Technology. *Hand-nested calico pocket spring construction *Springs diameter: 50mm *1,558 springs in 150 x 200cm size 5ft x 6ft 6in Upholstery. *Exclusive natural fillings: bonded Platinum Certified British fleece wool and cotton, Platinum Certified British fleece wool, blended Platinum Certified British fleece wool and cotton *Finest quality ticking *Hand tufted with felt washers Borders. *Upholstered with protective wool *2 rows of hand side-stitching *Horizontal handles *Air vents *Depth: 21cm All Vispring mattresses come with a 30 Year Guarantee.. .