... coil 3.26 years experience in mattress 5-zone pocketed spring mattressItem No.: 7701#Sizes: Single,full,queen,king. ... .3.Natual latex inside: natural latex 80kg/m3Spring layer:5-zone pocket spring: strictly in accordance with ergonomic, accurate calculation of the ... pressure of sleep.The 5- zone is designed for the neck,back, waist,hips and legs ...