Orvis Dave’S Oh-So-Iso | Dry Flies

Isonychias Or Slate Drakes Can Be Very Reliable Hatches During The Mid To Late Season. Dave’S Oh-So-Iso Drake Fly Is An Easy-To-See Pattern That Sits Down In The Film And Can Be Very Productive When You Find Yourself With These Gray-Winged Mayflies On The Water. In Natural.