A mix of synthetic fibers Long fiber Flashy Curled ends help create more bulk Does not absorb a lot of water Hareline Big Fly fiber is perfect for streamer patterns. One end of the Big Fly Fiber is curled to create more bulk without the weight. Big Fly Fiber does not absorb or hold water.Features Include:A mix of synthetic fibersLong fiberFlashyCurled ends help create more bulkDoes not absorb a lot of water