Nimbus/Halo Midge Emerger The also know as a Halo Midge, the Nimbus Midge has hooked quite a lot of large trout on the Miracle Mile in Wyoming. Specifically designed for those waters, it still works well in all tailwaters, freestone rivers, lakes & ponds. The Nimbus Midge is technically a "Split Foam Back" pattern. Black foam for the wing casing, black body w/ silver tinsel and white tufted hair at the collar. Available in sizes # 16 - # 20