the hillshire brands heat fresh&trade pouch solves a longtime dilemma for microwavable sandwiches. the package creates a moisture equilibrating &ldquosteam dome&rdquo during microwaving using a proprietary nonwoven bottom web and unique top web developed jointly by curwood and hillshire brands. consumers heat their sandwiches in one step,then easily peel the package open for serving. the package comprises a coextruded, nylonbased forming film paired with a non forming film that is a two ply extrusion lamination of cellulose and polypropylene. source www.curwood.com