Cap size 63 cm: the complete fit guide (2026)
Share
By Dominik, founder of Head of Wonder · Published · Last reviewed
If you measure 63 cm around your head, you sit right at the top of the range most cap brands quietly skip. I'm Dominik, and Head of Wonder exists because that's my measurement too. The XL we make is built around 61 cm and fits comfortably between 60 and 63 cm, so a 63 cm head lands inside our intended range, just at the upper edge.
That edge matters. At 63 cm a standard cap won't close on the last notch, sits high on the crown, and leaves a red mark on your forehead by lunchtime. Our XL is cut deeper, with a wider internal band and a longer adjustable strap, so the cap wraps your head rather than sitting on top of it.
This guide walks through what 63 cm means in practice, which style works for which kind of day, and where the boundary sits between XL and the XXL we now offer on one model.
Quick answer
A 63 cm cap measures 63 cm around the inside band. That's the upper edge of Head of Wonder's XL range, designed for 61 cm and fitting 60 to 63 cm. If your head measures 63 cm, the XL closes with strap room to spare and sits naturally without pinching. I'm Dominik, and I make these caps because that's roughly my own measurement. Every style runs the same fit, with a deeper crown and longer adjustable closure than the 'one size' caps that quietly top out around 58 cm. At 63 cm you can also look at our XXL trucker, which extends to 65 cm.
Key takeaways
- Head of Wonder's XL is built around 61 cm and fits 60–63 cm.
- A 63 cm head sits at the top of the XL range; the strap closes with notches to spare.
- Standard 'one size fits all' caps top out around 58 cm, so 63 cm needs a purpose-built XL.
- XXL fits 62–65 cm and is currently available on a single model: the black minimalist classic trucker.
- Free EU shipping on orders over 50 EUR.
- 14-day return window from the day your order arrives.
- Caps ship within two business days from our Prague warehouse to EU destinations.
Where 63 cm sits in the size landscape
For context, the average adult woman measures around 54 to 56 cm and the average man 56 to 58 cm. From 59 cm upward, a standard cap starts to ride high, fail to close on the last notch, or leave a forehead mark. By 60 cm you've left the mainstream entirely. At 63 cm you're firmly in the territory most retailers don't stock for at all.
Our XL exists precisely for this range. The storefront size guide lays out the full reference table. The short version: standard caps top out around 58 cm, our XL covers 60 to 63 cm, and the XXL trucker covers up to 65 cm.
A 63 cm measurement isn't an outlier; it's an underserved one. Roughly the same way some people wear shoes a couple of sizes above the rack-fill average, plenty of adults sit above 60 cm and have spent years assuming they just don't suit caps. They suit caps fine. The caps didn't suit them.
How to measure your head in a minute
- Grab a soft fabric tape measure. If you don't have one, a piece of string and a ruler works just as well.
- Wrap the tape about 1 cm above your ears, taking the widest path around your head.
- Bring it across the centre of your forehead, not above the hairline.
- Pull it snug but not tight; you should be able to slide one finger underneath comfortably.
- Read the number in centimetres. If you used string, mark the overlap and lay it flat against a ruler.
- Measure twice. A single centimetre is the difference between snug and pinching, and tape slips.
- If you land between sizes, round up — comfort wins over a tighter silhouette every time.
- For a fuller walkthrough with photos, see the measuring guide.
Five style choices at 63 cm
- Baseball cap: structured shape with a deeper crown, the classic everyday silhouette.
- Snapback: firm crown, flat brim, six-panel build with a plastic snap closure at the back.
- Trucker: solid front panel paired with mesh rear panels for summer breathability.
- Dad hat: soft and unstructured with a slightly curved brim, broken in from day one.
- XXL classic trucker in black minimalist: the one model that extends up to 65 cm if 63 cm sits at your upper edge.
Materials and what they mean at this size
Almost everything we make is organic cotton. The dad hats and baseball caps are 100 percent organic cotton; the snapback uses the same fabric throughout; the classic trucker pairs organic cotton on the front and crown with polyester mesh on the rear panels, which is what makes it breathe on warm afternoons.
There isn't a long list of fabrics, because there doesn't need to be. Cotton handles daily wear, breathes well, washes well, and softens with use. Mesh on a trucker is functional, not decorative — air actually moves through it. At 63 cm the material question matters less than the build: even a perfect fabric won't save a cap that's cut too shallow.
How to tell if your cap actually fits
- One finger slides comfortably between your forehead and the inside band, with no extra travel.
- The cap sits at the natural brow line, not perched high on the crown of your head.
- The strap closes well short of the last notch, leaving room to fine-tune later.
- Nothing pinches above the ears or across the back of the head.
- After ten minutes of wear, your forehead has no red mark when you take the cap off.
- The brim sits roughly level rather than tipped back, which is the giveaway that the crown is too shallow.
When 63 cm crosses into XXL territory
At 63 cm flat, our XL still fits. That's the upper edge of the intended range, and the strap closes with a notch or two to spare on every style.
If you measure 63 cm with your hair pulled tight, or you tend to wear caps looser day to day, you'll meet that upper edge sooner. That's where XXL helps. It's currently a single model — the black minimalist classic trucker — sized to fit 62 to 65 cm. The trucker's mesh rear is forgiving and the strap has more travel than the other styles, so it gives 63 cm heads some real growing room.
When this fits — and when it doesn't
Choose this if
- You measured at or near 63 cm and want a cap that closes with room to spare.
- You've spent years on 'one size' caps that perch on top of your head or leave forehead marks.
- You want a clean, modern silhouette without the retro-craft theatre.
- You care about organic cotton over synthetic blends.
- You're shopping inside the EU and want fast dispatch from Prague.
Look elsewhere if
- Your head measures below 60 cm; standard sizes will fit you better than our XL.
- Your head measures above 65 cm; we don't make a cap that fits above that.
- You want fitted (non-adjustable) caps; every style here uses an adjustable closure.
- You're shopping from outside the EU; we ship within EU borders only.
- You need a winter beanie; this guide covers caps and beanies are a separate range.
Frequently asked questions
Does a 63 cm cap fit a 62 cm head?
Yes. Our XL is built for 61 cm and fits 60 to 63 cm. A 62 cm head sits roughly in the middle of that range, so the cap closes with comfortable strap room and no pinching. The adjustable closure on every style lets you fine-tune the exact tightness — buckle on the dad hat, plastic snap on the snapback and trucker, hook-and-loop on the baseball cap. If you usually wear caps loose, leave a notch or two of strap slack at the back.
What does '63 cm' actually measure?
It's the circumference around the fullest part of your head, taken about 1 cm above your eyebrows and ears with a soft tape measure. That number is what every honest size guide refers to. If your tape reads 63 cm, that's the inside band measurement your cap needs to match. Standard mass-market caps usually max out around 58 cm, which is why a 63 cm measurement so often means caps that perch, pinch, or fail to close at the back.
Is 63 cm a big head size?
It's above the adult average (women typically 54 to 56 cm, men 56 to 58 cm) but it's not an outlier. Plenty of adults measure 60 cm or above, and the cap industry has just been slow to catch up. We don't treat 63 cm as a problem to apologise for; we treat it as the centre of what we make. Head size should never limit your choices.
Should I size up from 63 cm to XXL?
Usually no. Our XL is sized to fit 60 to 63 cm, so 63 cm sits at the intended top edge with strap room to spare on every style. The only reason to consider XXL is if 63 cm feels tight on you for some other reason: dense hair, the cap riding up over the day, or wanting more crown depth. XXL is currently available on a single model, the black minimalist classic trucker, and covers 62 to 65 cm.
How do I check the fit after my cap arrives?
Put it on and check three things. One finger should slide comfortably between your forehead and the inside band. The cap should sit at the natural brow line, not perch on top of the crown. After ten minutes, take it off and look for a red mark — there shouldn't be one. The adjustable closure lets you tighten or loosen across the 60 to 63 cm range, so small fit tweaks are easy. If something feels wrong, return it within 14 days.
Which style is best at 63 cm?
There's no single best; it depends on the silhouette you want. The structured baseball cap and the firm-crown snapback hold their shape day after day; the dad hat reads softer and breaks in immediately; the trucker breathes well in summer because of the mesh back. All four cover the same 60 to 63 cm range with the same intended fit. Browse our XL collection to see them next to each other.
Can I order outside the EU?
Not currently. We ship from Prague to all EU countries, but we don't ship to the UK, Switzerland, Norway, or the US. Within the EU, free shipping kicks in on orders over 50 EUR (or local equivalent), and the typical delivery window is three to seven business days after dispatch. Orders go out within two business days of landing in our system.
What if the cap doesn't fit after I receive it?
You have 14 days from the day your order arrives to send it back. Email info@headofwonder.com with your name and order number, and we'll walk you through the return. Items need to come back in unworn condition. Once we receive the return, we check it within a week and confirm the refund. The money lands back on the same payment method you used at checkout. Return shipping is at your expense.
What materials do you use?
Organic cotton, mostly. The dad hats, snapbacks, and baseball caps are organic cotton through the whole construction. The classic trucker uses organic cotton on the front and crown and polyester mesh on the rear panels, which is what gives it summer breathability. There's no long materials list because there doesn't need to be one. Cotton wears well, breathes well, and softens with use.
Methodology
This guide draws on Head of Wonder's own Shopify order data from the past year, where most orders shipped to Germany, the Netherlands, and Poland. It also draws on the metric hat sizing reference on Wikipedia. Size descriptions match the storefront's published size guide and the product copy across the XL range. I write from the same measurement most of these buyers have: my own head sits inside the XL band, which is why this size range exists at all.