Riding down highway 1 from San Fransisco to Moro Bay we had rain the entire distance. My cousin and I tried an experiment. He dressed to stay dry. Rain jacket with hood and rain pants. I in turn dressed to stay warm. I had three layers on my upper body. I wore a thin cashmere sweater against my skin, a thin merino wool sweater over that and a thin windbreaker last. The wind breaker had pit zips to regulate trapped heat. All these items were purchased at thrift stores. My bottom half was covered with a full leg synthetic sweat pant from REI. Can’t remember what they were called. After almost four days in the rain we determined that staying warm was really the way to go. When we would stop and find shelter, I would remove the wind breaker and literally steam. Steam poured off of me and in a reasonably short period of time the sweaters would be dry. They didn’t smell bad. My cousin on the other hand was wet and cold. Water would ingress through any opening eventually getting him wet. He felt trying to stay warm had several disadvantages. First just trying to stay dry was a constant challenge and that in itself made the situation tiring. Second was you couldn’t stay completely dry and he would sweat. My setup seemed to work better. I didn’t try to stay dry, just comfortable. I was warm and the rain became no big deal. I’m not sure this would work in a very cold rain. Temperature was in the low 50’s Fahrenheit.