Even rando racers love a good powder day, which is exactly why Dynafit came out with the Huascaran GTX Pro Shell Pants. Three-layer Gore-Tex Pro Shell fabric provides plenty of breathability to break trail for your friends and total moisture protection to keep you bone dry while you slay a few thousand feet of the 5% powder that fell overnight. Dynafit includes both hook-and-loop flaps and a drawcord around the waist and integrated gaiters at the ankles to keep out the snow.
If the weather turns bluebird on the second lap, just open the 3/4-length side zippers to let in some fresh air and keep from sweating while you head up for another lap. Of course, Dynafit's history of racing has made then incapable of building anything heavy, which is why these pants come in at a scant 630g.