Originally Posted by
Seattle Forrest
Layering is how you keep yourself warm enough. Two thin layers are warmer than one thick one, and, when you climb that first hill and start warming up, you can take a layer off.
Chest zippers are important on all upper body layers too. What is comfortable on the flats will have me burning up on a climb. I may unzip all the way down to my base layer even under 30 degrees on a slow hard climb, then zip back up on the decent. This is especially true for us big guys with our added insulation.