When you want to stay warm and toasty, but don't want the confinement of bulkier long sleeve jackets, Mountain Hardwear's Ozone Vest is the way to go. Great for crosscountry skiing or bouldering, when the arms are constantly in movement. Flat tape seems allow you to layer without the worry of snagging, and makes the Ozone comfortable under your pack. Tighten the neck and hem drawcords when the weather gets moody, to better trap your body heat.