There are many ways to attach a pom pom, but I have found one way, that has the rest beat. It's fast and easy, works for all types of poms and yarn, keeps the pom pom close to the hat, doesn't involve sewing, and the pom pom is easy to take on and off.
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The BEST way to attach a pom pom to a knitted hat – Knit with Henni
The BEST way to attach a pom pom to a knitted hat – Knit with