Surf hat size guide
One measurement and you're done. Bucket hats and surf caps, sized from your head circumference.
Sizing a cover instead? Surfboard cover size guide
One measurement. All the fit.
Hat sizing needs just one number — your head circumference. Measure it once and it covers the whole range.
The distance around your head just above your ears and eyebrows, measured in centimetres. This is the only number you need.
- Grab a soft tape (or a piece of string to measure against a ruler).
- Wrap it around your head just above your ears and eyebrows, level and snug — not tight.
- Read in centimetres. Between sizes? Size up — the adjustable chin cord takes up any slack.
Size chart
One system across the range — bucket hats and surf caps share the same four sizes.
Wide brim · Hard-shell insert · Chin cord
Bucket hats
5-panel peak · Neck flap · Chin cord
Surf caps| Size | Head circumference | Internal circumference target | Fit notes |
|---|---|---|---|
| Kids | 51–53 cm | 53 cm | Grom fit with rear adjustment |
| Small | 54–55 cm | 55 cm | Smaller adult heads / teens |
| Medium | 56–57 cm | 57 cm | Standard adult fit |
| Large | 58–61 cm | 61 cm | Larger adult heads |
Tolerance ±0.5 cm. Between two sizes? Size up — the chin cord and rear adjustment take up the slack.
What size hat am I?
Enter your head circumference and we'll match you to a size — same answer for bucket hats and surf caps.
Head circumference just above the ears is the only number a hat needs — no length, no width, no maths.
Between sizes, always size up. Every hat has an adjustable chin cord, and a roomy hat that stays on beats a tight one every time.
Hat sizing FAQ
How do I measure my head?
Wrap a soft tape around your head just above your ears and eyebrows, level and snug but not tight, and read the number in centimetres. No tape? Use string and measure it against a ruler.
I'm between two sizes — which do I pick?
Size up. Every hat has an adjustable chin cord, and the Kids and adult fits have rear adjustment to take up the slack. A roomy hat that stays on beats a tight one.
Do bucket hats and surf caps use the same sizes?
Yes — one system across the range. Kids 51–53 cm, Small 54–55 cm, Medium 56–57 cm, Large 58–61 cm, for both bucket hats and surf caps.
Will it stay on in the surf?
That's the point of them — the adjustable chin cord keeps it on when you duck-dive, and it floats if it does come loose.
What if my head is outside the 51–61 cm range?
Get in touch at support@boardsox.com.au and we'll sort you out.
What's the warranty?
Every Boardsox hat is backed by a 3-year warranty.