There is a decision to make on a lightweight jacket for the FRC. Waterproof or just windproof. This will only be known closer to the time. Rain is not common, but it has been known to surprise hikers. So is wind and the subsequent sand it blows around.
If I just go windproof, I can save weight by taking a Dynafit trail-runner ultralight windblocker. It has worked well on warm sunny days when strong winds threatened to freeze me.
Otherwise I'll settle for my trusty Crazy Shark jacket, which has taken me through many a mountain rain storm.
(Unfortunately the new model of the Shark no longer have front pockets. Luckily I bought an extra one of the previous season, so I have a replacement for future).