Claude is a beanie with fold in 1/1 ribs, without seam (circular knitting). The nice and round shape of the beanie is made by centring double decreases to the left and the right around four double ribs.

Finishing in stockinette stitch.

The beanie is one size only.

It’s worked with the pair of 4 mm needles of your choice. That’s one size smaller than what you’d need to obtain a gauge of 17 stitches by 24 rows for a square of 10 by 10 cm in stockinette stitch.