Fly Line Reviews

Monic GSP Skyline Trout Fly Line Review

Feb 23, 2016 · 2 min read
Ben FreemanBy Ben Freeman
Ben Freeman
Ben Freeman

Ben Freeman founded Trident Fly Fishing in 2012 to cut through the marketing fluff and provide anglers with the technical info they actually need. ...

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Monic GSP Skyline Trout Fly Line Review

Colorful stacked fly line boxes (green, orange, blue) with bold white Fly Line Shootout & Buyer's Guide headline

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

Monic fly line spool with green label in white case beside kraft hex box with blue GSP SKYLINE label and yellow Gold badge

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:

Minimal blue line graph on white background showing rise then long flat plateau — stylized fly line graphic for trout review

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. Pros:
  • Low-stretch core that doesn’t have added memory.
  • Adheres to AFFTA specs
Cons:
  • 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.
Ben Freeman
Written by

Ben Freeman

Ben Freeman founded Trident Fly Fishing in 2012 to cut through the marketing fluff and provide anglers with the technical info they actually need. He’s built his reputation by putting gear to the ultimate test in the world’s most unforgiving fisheries. With fishing stamps from over 22 countries and 17+ states, Ben’s passport is a roadmap of bucket list angling—from landing a 25lb Golden Dorado in Bolivia and 150lb Arapaima in Guyana to sight-casting for Roosterfish off the beaches in Baja. Whether it’s battling 60+mph winds to land a 20lb Rainbow at Jurassic Lake or a full day of casting 8in streamers in Mongolia, Ben has spent decades ensuring his gear performs when a trip of a lifetime is on the line.

At Trident, Ben serves as the lead gear geek, specializing in the deep-dive mechanics of rods, reels, and lines. Over the past 15 years, he's reviewed 250+ fly rods and 150+ fly reels and is likely one of the most prolific rod reviewers in the world. But he doesn't just curate the catalog; he scrutinizes every taper and drag system through the lens of a traveling angler who knows what it's like to have gear fail a thousand miles from home. For Ben, the mission is simple: leverage his experience across nearly 100 species to ensure that when you head into the wild, you’re equipped with gear that has been vetted by someone who has actually been there.

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