airflow through the material so that the material may serve as an effective sealing element the fibrous nature of the structure on the other hand does permit breathing of the fabric and permits escape of air through the seal when subjected to a substantial increase in pressure the zigzag stitching provided by the seams between the juxtaposed components tends to maintain the components in the flattened state which they assume during the stitching operation but the fibrous nature of the components permits them to have sufficient resilience to serve as an effective sealing element which may conform to variations in surfaces between which the sealing element is positioned it has been found that the lengthwise extensibility and widthwise inextensibility of the composite fabric permits the tape to be laid flat around a corner for the purpose of providing maximum tape effectiveness it has been found that the width of the composite tape should be less than one third of the radius of curvature of the sharpest curve to which the tape is subjected the tape of the present invention is also highly effective for wrap around framing for glass inserts and the like wherein the tape is wrapped around the edge of the glass insert prior to its insertion into the frame the same tape thereby serves as a framing gasket for both surfaces of the glass insert the lengthwise extensibility of the tape of the present invention enables the.