I wear capilene underwear and merino socks 365 days out of the year. My REI merino socks are amazing, and though not super breathable, I've yet to find a better pair of underwear than the capilene silk weight boxers. I have worn many pieces of merino base layers, most of them by smartwool, as I was able to make a prodeal purchase through REI as an employee. I love their T shirts, but the cuffs stretch on the long sleeves, and won't return to normal size until washed and dried. Ibex base layers, on the other hand, incorporated a synthetic cuff on a merino piece, and was the cure for that problem. My merino pieces have all, without fail, had random holes show up in the body of the fabric, not at a seem as I would expect. I'm not a smelly guy, as my wife will attest, but I have never had a problem with capilene being smelly on a hunt. I will usually wear the same base layer for a week. I do agree that the clammy feeling of the synthetics is aggravating, but the durability and warmth it provides has been paramount. I work outside almost everyday of the year in the Los Anchorage area, and being uncomfortable, i.e. cold, isn't an option.