Fly Line Shootout


Trident Fly Fishing is a full service fly shop. We spend a lot of time testing gear and writing shootouts to give you all of the tools to make your next trip a success.  We are not a blog, or a review site. 100% of our funding comes from your gear purchase, so if this shootout helps you on your next fly fishing adventure, support us by buying your next fly line (or better yet, your next rod and reel), from us.


This post is part of our Fly Line Shootout, so if you haven't read our main post, you probably want to check it out.

About Monic Fly Lines


Monic is a company that most of you probably haven’t heard of, but they have quite a history of research and development. The company was started in 1990 by a chemical engineer named Bob Goodale, and as you might expect from an engineer, Monic has been a leader in fly line development. They invented the clear floating fly line (and still have a patent for it).  Their latest trout line is the GSP Skyline Trout, which is built on their latest low-stretch core.


The Review:


Monic GSP Skyline Trout



Price: $69.95


The Hype: The GSP core yields lighting quick reactions for improved hook-ups. Now you can hook those ones who got away! Taper design allows for soft presentations with maximum control.


Taper Diagram:



Casting Notes:


The Monic Skyline Trout reminded me of the Cortland 444, but I’m not really sure why – the tapers are totally different. Perhaps it was due to the fact that both lines performed better on the Circa than the NRX. It’s a no-frills, true-to-specification 5-weight line, which means that it’s one of the lighter lines in the test, but it makes up for this with a low-stretch core that makes it feel heavier than it really is. The 444 was one of our favorite lines on the Circa, and the Monic was very similar, but didn’t cast quite as far.



  • Low-stretch core that doesn’t have added memory.
  • Adheres to AFFTA specs



  • Too light for faster rods
  • Smaller diameter means it doesn’t float as well as other lines.


Bottom line: We recommend this line for moderate and slower action rods, particularly if you’re looking for a low-stretch core.