This nymph pattern imitates a sunken Mayfly Spinner. I like to use this pattern throughout the Summer and Fall during the PMD Hatch. Yellow and Red on this great bead head nymph make it irresistible to trout in the Colorado Rockies. I like to use a stout saddle hackle on this fly because I believe it helps keep it from hanging up on the bottom. If you would like to catch a bunch of fish on spinners and other mayfly patterns, contact Capt. Matt at http://www.riplips.com