Nice advise guys. I have been mousing for years. I live on the Little M so it is convenient to do. It's been a while since I have visited this site and this is why my response is late. Everything said here is spot on especially the dark. The darker the better. This is why I do not boat fish at night. You really need to study and know the water in daylight before you go out at night. Fishing strange water in the dark is a disaster. I have tied many mouse patterns. The bigger are more realistic but harder to cast. I prefer a wide pattern mouse but fairly flat so there will be less resistance for casting. Another trick I use is to tie some glow in the dark material to the top of the mouse. This way I can see where it is and the fish below can not see the glow. You need a 7 wt. (no less) to hold those big browns.