SLF is a little bit curled fiber but really little bit and it is flat . It is very similar like polar fiber .But in our opinion, polar fiber is a little bit thicker and stiffer. SFL is thinner and softer than polar fiber.
Very impressive thread for body ,thorax or tag ( tip ). We recommend it for flies like Red Tag, Yellow Tag, Soldier Palmer, Sedge, terrestrial and similar insect. We also recommend it as " starter " .
1 spool - 12 meters or 13 yeards.