I saw the merino long sleeves @ Costco in Fairbanks for $16?. Tossed two in my cart thinking I’ll try them. A bit later went back and got two more knowing the ephemeral nature of Costco specials. Glad I did.
I wash them in the washer regular cycle. Lay them out on the wire clothes rack in the furnace room to dry.
Works great (they dry quickly), and zero problems.