Taylor Depue wrote a review of Icebreaker BodyFit 260 Tech Top - Long-Sleeve - Women's on July 9, 2012
Comfortable- feels like a warm layer of skin, keeps you warm without a coat @ 12,400' mild breeze and 46 deg! I love it so much I bought another icebreaker product!
Yes- you must buy if you pack in the high country, will not regret.
Breathable, snug, warm, not itchy, thumb holes, fits under any shirt,jacket nicely.