Bubble Wrap Cap by Skylark Yarns

Bubble Wrap Cap

Aran (8 wpi) ?
16 stitches = 4 inches
in stockinette stitch
US 7 - 4.5 mm
120 yards (110 m)
one size: 21-23" with ease
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This pattern is available for free.

From Lark’s Heart website:

"This hat has a great stretchy fit, thanks to the bubble wrap pattern stitch. Perfect for gifting when you aren’t sure of the recipient’s head size, or as a quick-knitting charity cap."