Pellon SewIn Flex Foam 60"x20" Package. Pellon FlexFoam is a lightweight sewin stabilizer consisting of a layer of foam sandwiched between two layers of soft fabric. It is excellent for use in crafts, accessories, and home dcor projects for an elegant finished look. It can be used in place of or in addition to other stabilizers. FlexFoam is a breeze to sew through and adds shape and body to projects such as computer cases, eyeglass cases, purses, tote bags, cup holders, diaper bags, and more Now available in a convenient 20 x 60 package.