CDC might be the most versatile feather for the fly tyer. These duck feathers, taken from the area of the preen gland, not their asses like most think. CDC's most common use in the dry flies and emerger, mainly because of the low cost, speed and ease of tying with it, but there are other great uses. Use subsurface in very interesting because of the structure of the feather it provides lots of movement and traps air. Give it a try in your nymph and wet fly patterns.