HAT SIZING CHART

Head size US Size UK Size Metric Size Headsize General Size
20 inches 6 3/8 6 1/4 51 51 cm XS
20 1/2 " 6 1/2 6 3/8 52 52 cm XS
21" 6 5/8 6 1/2 53 53 cm XS
21 1/4 " 6 3/4 6 5/8 54 54 cm S
21 5/8 " 6 7/8 6 3/4 55 55 cm S
22 " 7 6 7/8 56 56 cm M
22 3/8 " 7 1/8 7 57 57 cm M
22 3/4 " 7 1/4 7 1/8 58 58 cm L
23 1/4 " 7 3/8 7 1/4 59 59 cm L
23 5/8 " 7 1/2 7 3/8 60 60 cm XL
24 " 7 5/8 7 1/2 61 61 cm XL
24 3/8 " 7 3/4 7 5/8 62 62 cm XXL
24 3/4 " 7 7/8 7 3/4 63 63 cm XXL
25 1/8 " 8 7 7/8 64 64 cm XXL

It is essential that the size be correct for the head.
Measure the circumference around your head, keeping the tape level and firm, across the temples and above the eyebrow ridges. Check the size chart given above. For in-between measurements use the next size up.