Lipless crankbaits have no diving lip, but are typically weighted to be effective in 2 to 8 feet of water, and usually have a rattle. They have a wide profile and a very tight wiggle, and their flat sides move a lot of water. Without the lip, these tend to snag more easily. You'll have better luck with high-speed retrieves, burning the lure along the edges of weedlines and vertical walls, and "lipping" it over submerged weedbeds. One drawback - the lipless crankbait's weight and wide, flat sides make it easier for a thrashing fish to throw the lure.