The parachute hackle on the ARF Cripple Callibaetis allows the thorax to float in the surface film while the abdomen on the curved shank hook rides just below the surface. The trailing shuck is indicative of either an emerging insect, or an insect having difficulty escaping it's nymphal shuck. There is a hint of hi-vis color in the wing to aid in seeing this low floating fly.
Custom tied for your order, and sold in sets of three.
Price is $3.25/fly, $9.75 for set of 3 flies.