My base layer (under the SmartWool) is just REI’s store brand thin polypro. Works well.
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What I have is the thinnest but I just throw it in front of a vent or better yet a fan and in no time it's dry. If I'm driving somewhere I always take a small fan anyway. Even my neoprene drysuit is dry if in front of a fan overnight.Also, when you're on the road you may not be able to wash/dry merino fast enough w/o destroying the garments.