Size 4 mm or 6 mm US G/6 to J/10 knooking needle.

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From the North American Schachenmayr website:
Clever and bright, that´s this hat in Schachenmayr original Boston. No need for a bobble – the double point gives it a bright charm. And as with all My Mountain styles: it´s a perfect fit!

Finished dimensions:
Completed hat fits a head circumference of 20½ to 22 inches (52 to 56 cm) and measures approximately 8¼ inches (21 cm) tall.

Yarn Information:
Photographed in 00153 Ocean Denim
2 skeins
120 yards