A unique braided body material that is similar to diamond braid but smaller and softer. A neat trick is to pull on one loose end of the braid and "unravel" a section to make it even thinner for wrapping bodies on chironomid bodies, etc.
Phil Rowley has the following to say about Frostbite:
Frostbite is essentially a woven knotted Flashabou like material that is dispensed on cards or spools in the same manner as fly tying thread. When it comes to chironomid pupa and larva patterns Frostbite is a preferred material.
All Frostbite is carded.
Click here to learn to tie Phil Rowley's famous Frostbite Bloodworm.