444 Sylk

Cortland’s 444 Sylk is the first modern line designed for fine bamboo rods. The long front taper delicately presents flies on the water with minimal surface disturbance. Available in a Weight Forward or Double Taper.

- Ultra Supple
- Ultra thin Diameter
- Color of Natural Oiled Silk

WATER: Freshwater
LINE: Floating
TAPER: Weight Forward
LENGTH: 90ft
CORE: Braided Nylon Multifilament
SPECIES: Trout / Panfish / Grayling

Color MUSTARD
Size WF2F
Find a Local Dealer

United States deliveries usually take 3-8 business days.

International deliveries can take up to 7 - 18 days.

If you have any question about shipping Contact Us our customer service department is here to help.

 P65 - WARNING: Cancer and Reproductive Harm
www.P65Warnings.ca.gov


WATER LINE DENSITY TAPER CORE
Freshwater Floating Weight Forward Braided Nylon Multifilament

LINE SIZE GRAIN WEIGHT HEAD LENGTH TOTAL LENGTH
WF 2 80 gr. 37 ft. 90 ft.
WF 3 100 gr. 37 ft. 90 ft.
WF 4 120 gr. 37 ft. 90 ft.
WF 5 140 gr. 37 ft. 90 ft.
WF 6 160 gr. 37 ft. 90 ft.
WF 7 185 gr. 37 ft. 90 ft.
WF 8 210 gr. 37 ft. 90 ft.

Technologies

Single Welded Loop Technology Icon
Single Welded Loop

A front welded loop makes rigging, fast, easy, and reliable. Cortland loops are strong, secure, and durable.

Cold Temperature Technology Icon
COLD TEMPERATURE

Ideal use in 30-50 degree (F) temperatures.

Warm Temperature Technology Icon
WARM TEMPERATURE

Ideal use in 50 - 70 degree (F) temperatures.

FAQ

Cleaning your fly line is very important especially when fishing saltwater. Simply pull line off your reel into a clean bucket or tub of freshwater. Put roughly 1oz or more of Cortland’s Line Cleaner solution onto a clean rag or towel. Firmly squeeze the towel with Pro Line Cleaner around the line and slowly pull line through the towel. You should be able to see dirt or discolored streaks on the towel when finished.

Learn more about Cortland's Fly Line Cleaner Lubricant & Pads.

Hover: Neutral
Slow Intermediate: 1 IPS (Inches Per Second) 
Medium Intermediate: 1.5 - 2 IPS (Inches Per Second)
Fast Intermediate: 2 - 3 IPS (Inches Per Second)
Type 3 Sink Rate: 3 - 4 IPS (Inches Per Second)
Type 4 Sink Rate: 4 - 5 IPS (Inches Per Second)
Type 5 Sink Rate: 5 - 6 IPS (Inches Per Second)
Type 6 Sink Rate: 6 - 7 IPS (Inches Per Second)
Type 7 Sink Rate: 7 - 8 IPS (Inches Per Second)
Type 9 Sink Rate: 9+ IPS (Inches Per Second)

average rating 5.0 out of 5
Based on 10 reviews
  • 5 Stars
    10 Reviews
  • 4 Stars
    0 Reviews
  • 3 Stars
    0 Reviews
  • 2 Stars
    0 Reviews
  • 1 Star
    0 Reviews
100% of reviewers would recommend this product to a friend
Customer photos and videos
10 Reviews
Reviewed by George A.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Great with 8’6” 3 piece bamboo

Smooooooth! Older bamboo was just refinished. Line works perfectly. Easy to see as well. Tight lines!””

Loading...
Was this helpful?
Reviewed by Tony B.
I recommend this product
Rated 5 out of 5
Review posted

The best modern line for an old vintage feel.

Casts great on bamboo or fiberglass. Great line without all the work of old silk. Just dry with a paper towel and wipe on conditioner and put away for next time.

Loading...
Was this helpful?
Reviewed by ROBERT O.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Cortland 444 Classic Sylk WF5F

Hi own several vintage bamboo fly rods of varying length and weights. When it comes to deciding on an appropriate fly line for my reels, in my opinion, there really is no need to look further than the Cortland brand. The quality of their fly lines is very high. And I am able to catch many trout using these fly lines. I happen to like the Cortland 444 Classic Sylk fly line in various weights for my vintage bamboo fly rods. Everything seems to pair well.

Loading...
Was this helpful?
Reviewed by Paul B.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

444 Sylk

Great line and very smooth!

Loading...
Was this helpful?
Reviewed by Michael L.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

The Sylk replicates older lines very well.

Love the Sylk lines. They are a pleasure to cast on all of my older and slower rods. But I also really like them on some of my newer rods. I have a Douglas Upstream that really responds well to this line. I use it on small to medium sized streams, and the Sylk is equally happy making short accurate casts, as it is making precise roll casts. Great line.

Loading...
Was this helpful?
Reviewed by Joseph C.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Great Fly Line

I have using Cortland 444 classic on my bamboo rods for years. I decided to try the Cortland 444 Sylk after just purchasing a couple of new Hardy Bamboo rods recently. I am not disappointed at all. They cast extremely well. Planning on purchasing a few more for the rest of my bamboo rods.

Loading...
Was this helpful?
Reviewed by Thomas P.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

444 Sylk

I was having a lot of trouble finding the proper line for my new bamboo rod. It is classed as a 4 but my 4 wt line I had wouldn't cast. I tried a heavy 5 wt and I could tell it was too much for the rod. I bought some real silk in 5 wt what a waste of money. Cortland suggested 444 Sylk and I bought a 5wt. It works great. Very smooth.

Loading...
Was this helpful?
Reviewed by Tomy S.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Orvis Battenkill rod

I ordered the line because of reviews of other bamboo fly rod fishers. I have not been able to fish with the line but yard casting the line made the rod come alive.

Loading...
Was this helpful?

444 Sylk Fly Line – A Modern Line with a Timeless Soul

July 15th, 2025

Cortland’s 444 Sylk Fly Line is the first modern floating fly line specifically engineered to replicate the performance and feel of traditional silk lines—without the hassle of daily maintenance. Designed with the classic angler in mind, the Sylk pairs exceptionally well with vintage bamboo and modern fiberglass rods, delivering smooth loops, delicate landings, and natural presentation. If you’re after a fly line that complements the tempo of slow-action rods while offering the convenience and durability of modern synthetics, the 444 Sylk is your answer.

Unlike standard PVC-coated fly lines, the Sylk’s proprietary formulation allows for an incredibly supple and thin profile. This construction ensures low memory and precise control, especially when making roll casts, slack-line presentations, or short, quick shots under tight canopies. The muted yellow tone isn’t just a nod to silk’s golden hue—it’s also easy on wary fish, helping your line disappear against the water surface during subtle drifts. Whether you're targeting small stream brookies or technical spring creek trout, the Sylk rewards patience, finesse, and craft.

Designed for Bamboo, Born for Precision

The 444 Sylk shines in situations where tempo matters more than torque. If you're used to fast-action graphite and aggressive shooting tapers, casting the Sylk is a different experience—it invites you to slow down and reconnect with the rhythm of traditional fly fishing. The line loads progressively and responds to subtle shifts in timing and hand placement, making it a natural extension of your rod and casting motion. This makes it especially effective when paired with bamboo or glass rods, which flex deeply and recover more slowly.

Its thinner diameter allows it to slice through air and settle gently on the water’s surface, providing enhanced control in close-quarters or tricky drift situations. Anglers often choose Sylk for dry fly work on small streams, but it’s equally at home casting wets or soft hackles with grace. Because of its naturally soft composition, it excels at forming controlled loops, maintaining contact through the drift, and enabling mends without disrupting your fly’s position. The Sylk isn’t about distance—it's about precision, intimacy, and presence.

True-to-Tradition Performance with Modern Simplicity

Classic silk lines, while beautiful and responsive, required meticulous upkeep—oiling, drying, dressing. The 444 Sylk eliminates that burden while preserving the essence of the experience. You still get the signature softness and responsiveness, but with a floating profile that doesn’t need to be babied. It resists coiling in cooler temperatures, maintains integrity across seasons, and cleans easily with standard line dressing. This makes the Sylk a favorite among anglers who want vintage performance without vintage maintenance.

What makes the Sylk especially compelling is the casting confidence it instills over time. It teaches you to read the water, to move with patience, and to appreciate the nuance of perfectly placed casts. There’s something deeply satisfying about watching a size 18 elk hair caddis land with barely a ripple—and knowing it was your timing, not force, that got it there. The Cortland 444 Sylk doesn’t just bring back the feel of traditional fly fishing—it reminds you why you fell in love with it in the first place.