Guys, I was in the flyshop the other day and there was a silicon type fly with a diving lip. I don't know what it is. Since it dives, do I want to use one with a floating line or should I just use a sinking line?

Patrick, thats BOBPOPS fly, it's a
(siliclone pop lip!) get his book an you will not go wrong, (PoP Fleyes)
"GOOD LUCK GOOD TYIN"