we supply rebound foam as underlay. it has a good footfeeling and protect the carpet. the specifications as below: density: from 4.5lb to 8lb thickness: from 7mm to 15mm ( 1/2" , 7/16" , 3/8" ) roll size: 1.37m x 11m or 1.83m x 13.7m packing : plastic also can supply according customers request . we export it to USA, UK, Australia and so on now , we have strong experience for it . wellcome to contact with us . thank you