Hull's 1/2 Way PMD Comparadun is a true guide fly and a CFA original. Developed to be a more durable version of the original comparadun as well as the sparkle dun. This fly floats well because of the synthetic materials, while maintaining it's comparadun wing profile. The tail simulates an emerging nymph right before it shakes it's shuck, so about, halfway to emergence or so. This fly works wonders in the summer as a lead fly, with a dry stonefly or caddis behind, or even a PMD emerger.  Check out the whole selection of 1/2-Way Comparaduns; including a BWO (Baetis), Gray Drake, Green Drake, and March Brown version.