3Mô Loop Fastener SJ3571 is our best in class acrylic-based hook fastener with a 4 mil (0.10mm) polypropylene film liner featuring embossed 3M print. It is an attachment alternative to a wide variety of closures, including zippers, screws, snaps, hooks and more. We designed this fastener with a woven loop backing, covered with thousands of soft, pliable napped loops, providing for thousands of openings and closings (cycles). Commonly paired with 3Mô Hook Fastener SJ3572, this loop fastener can also engage with other 3Mô Hook Fasteners. To ensure stability and flatness, both the hook and the corresponding loop are preshrunk.