i found 'icebreaker' merino wool products to be warm, soft and comfortable for those chilly / cold (for us) mornings. a bit pricey - no more than the synthetics - but recently found some on sale at sierra trading post.
http://www.icebreaker.com/site/index.htmlhttp://www.sierratradingpost.com/thanks for the link, blast.
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“Everyone should have a horse. It is a great way to store meat without refrigeration. Just don’t ever get on one.”
- ponder's dad