The Blue Wing Olive, or BWO fly is one of the most popular fly patterns in existence, with good reason. The BWO produces fish in many varying conditions, regions, and seasons. it is a universal general match to the hatch. This pattern is a parachute variation of the BWO. it is extremely effective when fished on a natural drift. Cast upstream to achieve the longest possible natural drift. it is irresistible to trout when fished along the shoreline and under the tree canopy. Be sure you have a few in your box at all times. This 10-Pack includes flies tied in the most effective hook sizes (#12, 14, 16) for this pattern, providing top performance on the water.