Goose Biots are a classic material that have been used for years and come from large goose wing feathers. Great for legs, antennae, tails, and more, Goose Biots have a clean tapered look that gives a realistic addition to any pattern. With their UV2 Goose Biots, Spirit River applies their own double-dying process that adds UVF (ultraviolet fluorescence) and UVR (ultraviolet reflectance) ultraviolet wavelengths. This increases the visibility of this material for fish and is an easy way to increase success. A great choice whenever you want to enhance visibility while maintaining that natural look and profile, Spirit River’s UV2 Goose Biots are a staple for a ton of different flies.