What is a thrum and why is it in my mittens? from Knitting Daily: "Roving (unspun sheep's wool) is separated into wisps, which are then knit into the stitches along with the working yarn as before. The ends of the fleece form little poufy pillows inside your mittens, and your fingers start thanking you the minute a pair of thrummed mittens is on your hands.Basically, you're making a sheepskin for the inside of your mittens."
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