I think under armor is cold-especially in a cool down situation....Like the synthetic-pataguchii, REI MTS, and the new wool products are very warm but will not dry as fast as the synthetics-which I have done under a tarp in a rain storm----TO EACH THEIR OWN. The other thing that I would say is that the tweeking of one's "system" never stops-make notes on trail at home and keep honing your system.....including the repair kit, first aide kit.....fishing box....and such ;)......food and cooking :DGroup Dynamics :oand for God's sake share it with as many as you can ;D