underlay for laminate flooring on concrete

{"cid":"91213827","title":"Felt 4mm Foam Underlay Overlap Blue Underlay For Laminate Flooring","imgUrl":"https:\/\/img.chinax.com\/nimg\/b5\/dd\/a9312334417f54be572afe009faa-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"No Brand","Model Number":"FELT 40-B","Minimum Order Quantity":"1000 sqm","Delivery Time":"12WORKING DAYS","Certification":"SGS","Place of Origin":"China","Payment Terms":"T\/T","Supply Ability":"1 million sqm per week","Packaging Details":"packed with shrink wrapped","Material":"FELT","Thickness":"4mm","Density":"620g\/m2","Size":"200 sqft\/roll","Coating":"Blue PE film","Application":"floating floor, floor heating system","Feature":"Durable, easy installation","Accessories":"overlap, tape"}}

{"cid":"91212174","title":"White Aluminum 3 In 1 Laminate Flooring Underlayment Vapor Barrier Standard","imgUrl":"https:\/\/img.chinax.com\/nimg\/0a\/e7\/1cb8a17cec4455dac0035ebbc807-200x200-1.jpg","attrs":{"Price":"0.3USD\/sq.m.","Brand Name":"new top star","Model Number":"EPE30-S","Minimum Order Quantity":"1000SQ.M.","Delivery Time":"5-8 work days","Certification":"Rohs.REACH.ISO","Place of Origin":"china","Supply Ability":"2000000sq.m. per month","Packaging Details":"shrink-wrapped","Material":"3mm Polyethylene Foam Laminated With A Vapor Barrier","Density":"22KGS\/m\u00b3","Surface Area":"200sq.ft\/roll","Application":"Floating Floor","Usage":"Residential & Light Commercial","Installation Method":"Floating"}}