Modern Barcelona Wooden Frame Chair With Ottoman 1,Tight sofa upholstery 2,Solid ... Elastic:1.the elastic at the saddle should be with high elasticity2.thick is more than 2mm;3. ... Regarding the material, we use natural emulsion, polyurethane, natural down and superfine fibre, which make the sofa elastic, and ... polyurethane, natural emulsion, natural down and superfine fibre.S O F A C O N S T R U C T ...