this spring mattress inner spec as below: knitted fabric,memory foam,high density foam, spring,size, T,F,Q,K. can be compressed 1. High grade knitted fabric, 650g/m2 2. Quilted foam: 2cm thickness, 25kg/m3 +8000# polyester 3. Inner memory foam, 5cm thickness , density: 60kg/m3 4. Inner latex, 2cm thickness, density: 70kg/m3 5. Nov-woven fabric, 80kg/m2 6. Inner foam: 1cm thickness, density: 30kg/ ...