If you have not made the switch from poly-pro to merino wool yet then you are missing out. I have been so happy with my Icebreaker base layer. Long gone are the days of stinky polypropelene. It used to be that if I even thought about sweating my synthetic baselayers would reek. I just got this insulating piece and have worn 5 times without washing and still can not smell a thing. Also it is very soft for wool. Very comfortable, highly recomended.
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