The gray RS2 is one of the best and simplest trout flies out there. This pattern catches fish, no doubt about that. There are many variations of the RS2 but the gray one seems to be a favorite amongst most anglers. This pattern does a highly effective job at imitating most all midges and mayflies. Rarely is there a better choice to tie on than the RS2, and this one is no different. Have a couple gray RS2s for any trout fishing venture.