I have both an alpaca sweater and hat that I bought in Peru when we hiked to Machu Picchu. Quite inexpensive down there, and they are beautiful.

And man, do they keep me toasty warm! SO yeah, on cold trips I take them along!
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Check our our website: http://www.backpackthesierra.com/

Or just read a good mystery novel set in the Sierra; https://www.amazon.com/Danger-Falling-Rocks-Paul-Wagner/dp/0984884963