In my opinion, don't bother with xcountry pants unless you are out in the backcountry.  Any normal athletic pant with a base layer underneath is good for those teen-20 degree days and throw on the downhill pants for anything colder.  I will frequently use downhill pants, short sleeve shirt, light or no gloves, and a headband on the trails.  I always bring an extra layer in my pack along with plenty of water, but rarely bust out the jacket unless weather goes crazy. Most of the purely xcountry pants are not waterproof either, so watch what you buy.

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