I machine wash (handwash setting)/dry(low/delicate) my smartwool socks, merino sweater, and merino buffs. They are all holding up great.
If I was gonna put the beat down on some lightweight merino bases I may hang dry them, but all my baselayers are synth (Patagonia Cap1 is my fave). I like a real light/delicate layer next to skin.
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