I was in Costco yesterday and picked up 2 T shirts made from 52% merino and 48% polyester for $15 each. I haven't tried them on the trail yet but they are quite thin and I love my long sleeve 100% merino shirts from costco. These are True North brand and sewn in Canada.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Merino-Polyester Blend T