Recent studies at major universities show that gamefish can see farther into the U.V. spectrum than humans. Playing on that knowledge, I tried switching from standard flash materials to the ne U.V. ones - WOW what a difference! On average we landed 3 to 1 more fish using the U.V. Krystal Flash than standard Krystal Flash. Use only a little, 6 to 10 strands per side max. There is such a thing as getting too much of a good thing! This material may not look as flashy to us, but we don't need to catch fishermen, we need to catch fish!