Measure around the forehead, just above the ears, and around the hair in the back to determine head size. If your measurement falls on a size cut off guideline, we recommend that you order the smaller size as there is a bit of stretch in the fleece material.
Extra Small/Small = 51 - 54 cm (UK Hat Size Up to 6 3/4)
Medium (one size fits most) = 55 - 59 cm (UK Hat Size 6 7/8 - 7 3/8)
Extra Large/Large = 60 - 63 cm (UK Hat Size 7 1/2 and up)