PRANA Bike cover is made of high quality nylon which will protect your PRANA from Dust, Water & UV Rays. It has 2 Thread Interlock Stitching for Durability and Better Finishing. If stitches are visible, they’re not weak, the main stitching is on the inside which is interlocked making it stronger and durable. Waterproof Heavy Duty Fabric Used to stitch. The cover matches body profile perfectly and separate space For Mirror. It is totally outdoor and indoor use material stitched with latest machine technology.