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Merino is best but if you buy online, but beware of falsely advertised Merino, as it can cause an itch even though you may not be allergic to lanolin, as the micron scale of the fiber is over 25, and at that past the threshold of itch.
Merino is dynamic in its ability to hold a correct ammount of heat. The fibers open when its hot (and allow better moisture wicking) and close when it's cold, to allow better warmth retention.
The thinner the Merino, the faster it dries. If you wear it, it dries much faster as your body heat aids it (i am talking, you are in your tent for example, not boosting up a mountain sweating like cunt)
Merino is anti-bacterial, so you can take 2 pairs of socks, and 2 pairs of undies and rotate a clean at night + dry at day.
I work at kathmandu, and we have a synthetic that is similar to Merino, but not dynamic, and similar to polypro, but much better moisture wicking, and still anti bac whilst being next to skin (not compression). Its a little better for those who dont want to spend hundreds on Merino, and have access to cleaning facilities.
