Shine and soft!
Angel Fiber is an extremely fine mylar material which is often used on bait fish patterns for its shine and softness.
The uses of Angel Fiber are not however limited to bait fish patterns. Many tyers use Angel Hair on bass bugs, clousers, wooly buggers, and any other fly where a bit of flash and movement are desired.
When stripped through the water Angel Hair moves better than any material I have ever used.