Thorax Dun

The Thorax Dun was popularized by legendary angler Vincent Marinaro in the mid-20th century as part of his groundbreaking approach to imitating mayflies with precision. Designed specifically to fool selective trout feeding on emerging or freshly hatched duns, this pattern revolutionized dry fly fishing with its innovative use of hackle to create a low-floating, lifelike silhouette on the water's surface.

Use it during calm hatches on smooth water; the flat hackle helps mimic the surface tension disturbances caused by a natural dun, enticing even the most wary trout.