Tom Travis is considered one of the premier fly tiers in the world working out of his shop in Livingston, Montana. He created an excellent series of parachute emergers covering a number of the major mayfly species. In this case, he imitates the Baetis or Blue Wing Olive Emerger. Look for all the Travis Hi-Vis emergers and keep supply in your box. Color, Natural. BWO emerger available in sizes: 16, 18, 20.