Outdoor Research Virtuoso Hooded Down Jacket - Women's - $112.48

You might get cold in the Sierras unless you are geared up in the Womens Virtuoso Down Jacket from Outdoor Research. The 650-fill down holds body heat in so you stay nice and toasty, and you can seal out cold air by cinching the dual hem drawcord and tightening the hook-and-loop cuff tabs. The entire jacket compresses into one of the hand pockets so you have a compact, packable jacket that doubles as a down-filled pillow when sleepy time comes around. - $112.48