This step is optional but adds color to the hat. Stitch a V, then cut your ends inside the hat and tie them off. Repeat all over the hat.
Wrap the yarn around four of your fingers about 100 times. Then, carefully slide it off of your hand so it keeps its shape.
Cut a piece of yarn several inches long. Tie around the center of the looped very tightly. Then, take scissors and cut through the loops.
Thread your needle again and attach the pom pom to the top of the hat by threading it through the pom pom and tying it off inside the hat. Use several loops to secure.
Use scissors to trim the pom pom and make it more even. Make sure all loose ends are trimmed.