Bluewater sewn prusiks feature a sewn termination for the ultimate in strength and safety. Computer controlled sewing machines precisely stitch each prusik with 277 polyester thread for a strong and reliable stitch. BlueWater sewn prusiks are much lighter and less bulky than tied prusiks. These have a low profile with no knots to become loose or get in your way. Manufactured in the U.S.A. from Domestic and Globally sourced raw materials.