The olive RS2 is the most versatile of the many RS2 options out there. This pattern looks very identical to most midges and mayflies you will encounter in a trout river. Anglers see success fishing this fly as an emerger and as a basic nymph. Fish will often eat the olive RS2 throughout the water column. Anglers should carry a few of this pattern in different sizes to be covered for almost all situations they could come across.