BH Soft Hackle Olive - Bead Head. Don't let anyone tell you this fly does not have back bone. The Bead Head Olive Soft Hackle is a fly that will save many a difficult day, especially with those tricky Rainbow Trout. This fly has been known to bring in many of those wonders in a single sitting and that is just the norm. As far as Wet Flies go this fly is a guaranteed must have. The Bead-Head Olive Soft Hackle can be used to fish for more than just the bo's, brook, and brown trout also cannot get enough of them.