Uni Flexx is a tying material made by Uni Canada Products and is a very elastic fiber useful to tie flies like buzzers or nymphs. The Uni Flexx is synthetic like silicone and rubber and it can be stretch to desire diameter to make bodies on small hooks but also on larger hooks in the same time.
The material is very appreciated especially for making buzzers and chironomid flies. But can be split and can be used to make legs and antennae for terrestrial flies. Lately is used for making bodies of nymphs and pupae's. Resistant and silky, Uni Flexx is a great all around tying materials with lots of applications