I got my monthly email from The Journal of Mountain Hunting yesterday and as usual it was full of interesting stuff. One of the tidbits was a YouTube video comparing synthetic to merino in the rewarming drill. I've always been a merino guy, comparing it to each new generation of synthetic base layers. I finally switched out of the merino a couple years ago when Sitka did their latest base layer redesign.
Take a look:
Dynamic Rewarming Drill - YouTube
Take a look:
Dynamic Rewarming Drill - YouTube