Hareline UV2 Select CDC Feathers deliver enhanced visibility and lifelike movement for fly tying. These UV2-treated Cul de Canard (CDC) patches are ideal for emergers, dry flies and soft-hackle patterns, providing subtle flotation and realistic leg action that trout respond to during blanket hatches and low-light conditions. Key Features UV2 Dye: Spirit River's UV2 double-dye process adds ultraviolet fluorescence and reflectance to CDC fibers for increased attraction to fish. Premium CDC: Carefully selected Cul de Canard quills provide soft, buoyant fibers that tie in easily for mayflies, emergers and delicate dry patterns. Protective Packaging: Feathers are neatly stacked/packed to protect quills from breaking and to make fiber selection quick and convenient at the vise. Fly tyers choose Hareline for consistent material quality and ready-to-use CDC patches. The UV2 treatment enhances natural ultraviolet patterns found in insect wings, making these feathers particularly effective during emergent hatches and in stained or low-light water. Use them for realistic shucks, soft-hackle legs, wing cases and subtle buoyant bodies — they pair well with common tying threads, dubbings and hooks used for trout patterns.