What it is
Hareline UV2 Calf Tail is natural calf tail hair that’s been treated to be both ultraviolet fluorescent and ultraviolet reflective. The fibers are soft and supple but still strong and durable, and they hold a clean, high-visibility profile on the hook. In the water it keeps a lively, hair-wing movement without collapsing.
What to tie with it
Use it anywhere you want a defined hair wing or an easy-to-see upright target, including dry flies, nymphs, wets, and streamers. It’s a go-to for upright wings and parachute posts, and it’s also handy when you want to build a stiff, durable silhouette that helps turn a pattern into a fishable cripple. On Wulff-style wings, you’ll typically secure it with firm wraps and a figure-eight between the wing bunches to keep the pair split and standing.
Flies and the fish they're for
Calf tail is a classic wing material for Wulff patterns like the Royal Wulff and the Thunderhead, which are fished as high-floating attractor dries for trout in rivers and freestone streams. It’s also used in hopper-style dry flies tied with calf tail wings, a common choice for targeting trout during terrestrial season on bankside water. Calf tail also shows up as an upright wing on mayfly dry patterns, another staple for trout on selective water when you need a clear, visible wing to track the drift.
