I would question the use of heavy base layer clothing. The base layer's job is to keep you dry or to dry you out as fast as possible. Keeping you warm is the job of the insulation layer. Trying to combine the two can back fire on you. It, for instance, will take longer to dry out. I usually use just their Silkweight, or, if it's near, or below zero, their medium weight.
My expereince with both of Patagonia's Merino Wool and Capliene in the medium weight is that the Capliene dries out much faster. The wool is warmer, but that doesn't mean much when you have other clothing along for warmth.
This fast drying quality I find really important when I do a tough climb over a few miles before sunup and then stop to glass for an hour or two. That's where Capliene has it all over Merino Wool. E
