Spirit River UV2 Strung Saddle - The Spirit River UV2 Strung Saddle comes from a rooster and since they are strung have a stiffness and bounce that all fly anglers are looking for. Spirit River uses the UV2 technology which is the double dye process that adds the UV Florescence and UV Reflectance and makes the Spirit River the top of the line in the fly tying material industry. UV2 TechnologyUV FlorescenceUV ReflectanceDouble dye process