Stretch-Guard stitch bonded polyester is one of the strongest materials available to the roofing industry for use as reinforcement in cold process roofing. Stitch bonding offers an unusual combination of high strength properties with good elongation for excellent thermal stress force accommodations. P272 is a soft polyester that will readily conform to embedded gravel and standing seam metal roof decks. It is also much easier to handle and apply properly than other soft polyester sheets.