Synthetic materials have a great influence in how new flies are created. They are more durable, float better and are often easier to see than traditional materials. This is the case with the Vis-A-Dun Blue Winged Olive a newer variation of the classic Thorax pattern. The synthetic wing is much easier to see and is more durable than a turkey flat wing. This pattern like the Thorax has the exact profile and impression of a mayfly dun on the water. The trimmed hackle makes it land upright and float along naturally on the water. Selective fish have a hard time refusing this visible effective pattern.