Fully flexible mattress with Bonell coilspring, wire-size 2,2mm: 4-duct. Pad carrier holohedral on both sides ( 450/sqm): core is upholstered with foam ( 20 mm RG 28 (density) per side). Both sides are quilted with soft foam (transverse quilting). Smooth side borders with deluxe straight binding. Material for upholstery 69% cotton and 31% synthetic.