Designed by legendary angler and fly tyer Ren Harrop on the Henrys Fork, the CDC Thorax is a highly refined mayfly dun imitation built for technical dry-fly fishing.

The fly features a slender quill body for realistic segmentation and profile, while the CDC and hackle wing leaves an exceptionally lifelike footprint on the water. Its sparse, low-riding design makes it especially effective for selective trout in calm water. One of those “must have” flies for the Ranch!