Semper Fli

Semperfli Straggle String


At first glance Straggle String UV may seem like many of the other “fritz” type tying materials... Take a closer look though and you will find Straggle String UV  is a carefully developed fly tying material and NOT just another off the peg product poached from the textiles trade.


  • Finer core than typical “fritz” type materials

  • Widest range of natural fly tying colours available

  • Colours chosen by and dyed by the Semper Fli team

  • Coded colours to integrate with the Semper Fli dubbing system

  • Reduced fibre density (less like a blob more like legs or a hackle)

  • Reflective/refractive fibres provide insect-like iridescence

  • Subtle UV properties give the impression of life-like movement


The fact is it’s really up to you... but here are a few tips and tricks from the Semper Fli team to get you started.

  • The fine core means really slim bodies are possible. Try SF3300 on a curved hook for a fantastic bloodworm pattern or any of the natural colours under a shellback for a superb (and very quick to tie) shrimp.

  • Lower fibre density coupled with fine core makes great thoraxes for bead head flies.

  • The fine core absorbs much less water than standard fritz meaning Straggle String UV can be used in dry fly patterns

  • Finer material means smaller flies. Sizes 16, 18, and 20 can easily be tied.

  • The wide range of natural colours is great for imitating the natural invertebrates that make up fishes’ diet.

  • Bright and fluoro colours are great for “hot spots” or attractor patterns.

  • Natural colours coupled with Straggle String UV’s life-like illusion of movement means simple flies can be tied without the need for other materials. Check out the JP Straggle Nymph!   

What does SF3050 Mean?

Semperfli has a dedicated colouring system with over 140 colours chips on  2 colour cards that can be laminated and used at the river bank to "match the hatch". Now for the first time ever you can match a massive range of flies to dubbing and other materials. However rather than name the colours we have given them numbers so SF3050 is the colour from the chip on the Semperfli card. This is to make it simpler for you long term, after all everyone has an olive material or dubbing in their tying boxes, we have 14 different olives colours alone! Try our card which is available for just £1.99 including post and packing, laminate it and take it to the river to match the hatch. You can then use this card at your local angling shop to match the hatch or use it to get Semperfli materials in exactly the colour you require, no longer do you need to guess which colour olive you saw at the river bank in preperation for your next trip!

SF4400 UV
SF5200 UV
SF6150 UV
Litchen UV
SF5150L UV
SF0050 UV
Fluro Red
White SF1000
Sky Blue SF9050
Black SF0050
Sunburst SF5450
Brown Olive SF5300
Fl Orange SF4150
Maroon SF3050
Dark Claret
Fl Yellow
Grey SF0450
Pale Blue Dun SF1350
Iron Grey - SF3000
Green Olive SF6050

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