I used to recommend Frog Troggs, but not long ago I was caught in a real downpour and stopped to put on my Frogg Toggs. They did a moderately good job of keeping me dry, but the way they fit they flapped about annoyingly when I was at anything over about 30 mph, even on a fully faired motorcycle. Clearly they were not designed for use on a motorcycle. So while I still carry the Frog Togg pants, I now carry a Tourmaster rain jacket (Sentinel LE model). It is designed specifically for motorcycle use and is of high quality construction. It is not cheap, at about $140, but not as expensive as some others like the Klim (which I wanted since it is made of Gore-Tex, which should be not as hot in the summer as most rain jackets, but the Hi-viz model is unavailable at least until next year). A nice feature on the Tourmaster is a built in hood that rolls up within the collar, but can be used to cover the head under a helmet and keep rain from coming down the back of your neck. It also has an opening that you can reach through to access something under the jacket directly, intended to allow a LEO to access his firearm and I use it the same way since I am always armed when riding. I bought mine through Revzilla.com and ordered it in the same size as any other jacket that I would order and it does seem true to size.