... this spring mattress inner spec as below: knitted fabric,memory foam,high density foam, spring, ... F,Q,K. can be compressed 1. High grade knitted fabric, 650g/m2 2. Quilted foam: 2cm thickness, ... , 2cm thickness, density: 70kg/m3 5. Nov-woven fabric, 80kg/m2 6. Inner foam: 1cm thickness, density ... 1cm thickness, density: 30kg/m3 9. Bottom fabric: jacquard damask fabric, 550g/m2 10. Quilted foam: 0.6cm ...