Ultravision UV2 is a proprietary process of dying that enhances material, adds visibility and natural colour spectrums. A double dye process gives UV2 materials and flies the added UVF/UVR ultraviolet wavelengths. Infused with UV2 technology, these hairs will stand out to fish in a way that normal hair cannot. Elk hair has a multitude of uses and is the essential ingredient in Al Troths famous pattern the Elk Hair Caddis.