New Era's 59FIFTY fitted chart runs from 7 to 8 (22–25 in, 55.8–63.5 cm), Flexfit's largest stretch-fit size (XL/2XL) is listed as 7⅜–8, and Richardson's 112 XL is listed at about 7¼–7⅞. So all three top out at 8 or below. MONGO snapbacks start at 7½ and go to 8½ (23.6–26.7 in / 60–68 cm). Below is each brand's published sizing side by side, in inches and cm.
First time measuring? Measure your head in 2 minutes, then come back. All the general sizes are on the hat size chart.
Fitted hat size chart: all brands at a glance
| Hat size | Head (in / cm) | New Era 59FIFTY | Largest stretch / adjustable that covers it |
|---|---|---|---|
| 7⅜ | 23⅛ / 58.7 | 7⅜ | NE 39THIRTY S/M–M/L · Flexfit L/XL · Richardson 112 OSFM |
| 7½ | 23½ / 59.6 | 7½ | NE 39THIRTY M/L · Flexfit L/XL or XL/2XL · Richardson 112 OSFM |
| 7⅝ | 23⅞ / 60.6 | 7⅝ | NE 39THIRTY M/L–L/XL · Flexfit L/XL or XL/2XL · Richardson 112 OSFM or 112 XL |
| 7¾ | 24¼ / 61.5 | 7¾ | NE 39THIRTY L/XL · Flexfit XL/2XL · Richardson 112 OSFM (top) or 112 XL |
| 7⅞ | 24⅝ / 62.5 | 7⅞ | NE 39THIRTY L/XL (top) · Flexfit XL/2XL · Richardson 112 XL (top) |
| 8 | 25 / 63.5 | 8 (largest listed) | Flexfit XL/2XL (top) |
| 8⅛ | 25½ / 64.8 | Not listed | None of the three · MONGO fits |
| 8¼ | 25⅞ / 65.8 | Not listed | None of the three · MONGO fits |
| 8⅜ | 26¼ / 66.8 | Not listed | None of the three · MONGO fits |
| 8½ | 26¾ / 67.8 | Not listed | None of the three · MONGO fits |
Inches and cm for 7⅜–8 are New Era's published figures. 8⅛–8½ are calculated (size × π). MONGO fits every row from 7½ to 8½.
New Era hat size chart
New Era 59FIFTY size chart (fitted)
The 59FIFTY is the classic closed-back fitted cap. New Era's official sizing chart lists these sizes:
| 59FIFTY size | Inches | CM |
|---|---|---|
| 7 | 22 | 55.8 |
| 7⅛ | 22⅜ | 56.8 |
| 7¼ | 22¾ | 57.7 |
| 7⅜ | 23⅛ | 58.7 |
| 7½ | 23½ | 59.6 |
| 7⅝ | 23⅞ | 60.6 |
| 7¾ | 24¼ | 61.5 |
| 7⅞ | 24⅝ | 62.5 |
| 8 | 25 | 63.5 |
New Era's advice if you're between sizes: round up. Its kids' 59FIFTY runs 6 to 6¾ (48.2–53.9 cm). New Era also notes that the cm on the label may not match head circumference exactly, so go by the size number.
Fair point for New Era: the 59FIFTY is one of the few mainstream fitted caps sold all the way up to 8. If you're an 8 or under and you like a fitted cap, it's a real option. One of our customers, Soraya W., described the problem at the top end: "I am an 8 in traditional New Era sizing and even an 8 is slightly small."
New Era 39THIRTY (stretch-fit) and 9FORTY (adjustable)
| Size | Inches | CM |
|---|---|---|
| 39THIRTY S/M | 22⅜–23⅛ | 56.8–58.7 |
| 39THIRTY M/L | 23⅛–23⅞ | 58.7–60.6 |
| 39THIRTY L/XL | 23⅞–24⅝ | 60.6–62.5 |
| 9FORTY One Size | 22–23⅞ | 55.8–60.6 |
The 39THIRTY's largest size, L/XL, tops out at a 7⅞ head. The 9FORTY one-size adjustable stops at 23⅞ in, which is a 7⅝. Above that, a New Era snapback is on its last snap or not closing.
Flexfit size chart
Flexfit caps use a stretch band, so each size covers a range. Flexfit's own sizing chart is published as an image we couldn't read as text, so the figures below come from the manufacturer spec sheet for the best-known model, the Flexfit 6277 Wooly Combed cap, as distributed by SanMar:
| Flexfit 6277 size | Hat sizes | Head (inches, as printed) |
|---|---|---|
| S/M | 6¾–7¼ | 21¼–22¾ |
| L/XL | 7⅛–7⅝ | 22⅜–23⅞ |
| XL/2XL | 7⅜–8 | 24⅜–25⅝ |
Read the XL/2XL row carefully. The spec sheet prints the hat-size range as 7⅜–8 but the head-size range as 24⅜–25⅝ in. Those don't line up (7⅜ is about 23⅛ in). Converted with the hat-size formula, the head-size column works out to roughly 7¾–8⅛, so XL/2XL is best for 7¾–8 heads, and its fit at 7⅜–7⅝ is uncertain. The spec sheet also says XL/2XL comes only in some colours (Black, Dark Grey, Dark Navy and Navy).
The Flexfit 110 (a snapback with a stretch band) is listed as one size fitting hat sizes 6½–7⅞ (20⅜–24⅝ in). That's a wide range, and one of the better "one size" options for a 7¾ head.
Richardson 112 and 112 XL size chart
The Richardson 112 is the trucker cap you've seen on half the job sites in America. It's a snapback. Richardson lists four sizes for it: Youth, SM, MD-LG and XL, with Youth, Small and X-Large available only in select colours.
| Richardson 112 | Approx. hat sizes | Approx. head (in / cm) |
|---|---|---|
| 112 OSFM (MD-LG) | 7–7¾ | 22–24¼ / 56–62 |
| 112 XL (R112XL) | 7¼–7⅞ | 22¾–24⅝ / 58–63 |
The hat-size ranges come from a Richardson size chart published by a licensed retailer. Richardson's own Mid Pro chart places OSFM/MD-LG at the 24¼ in (62 cm) mark and XL at 24⅝ in (63 cm), which agrees with those upper limits. So the 112 XL buys you about one extra eighth of a size over the regular 112, and tops out at a 7⅞.
Where each brand runs out
| Hat | Largest listed size | Largest head |
|---|---|---|
| New Era 9FORTY (adjustable) | One size | 23⅞ in / 60.6 cm (7⅝) |
| New Era 39THIRTY L/XL | L/XL | 24⅝ in / 62.5 cm (7⅞) |
| New Era 59FIFTY | 8 | 25 in / 63.5 cm |
| Flexfit 110 (one size) | OSFA | 24⅝ in (7⅞) |
| Flexfit 6277 XL/2XL | XL/2XL | Size 8 (25⅝ in as printed) |
| Richardson 112 XL | XL | About 7⅞ (24⅝ in / 63 cm) |
| MONGO snapbacks | XL–2XL | 8½ (26.7 in / 68 cm) |
So which should you buy?
- 7⅜ or under: almost anything fits. One-size caps from New Era, Flexfit and Richardson cover you. You don't need an XL hat.
- 7½–7⅝: you're at the top of most one-size caps. A 59FIFTY in your size, a Flexfit L/XL or XL/2XL, or the Richardson 112 should work. MONGO fits too, with room to spare.
- 7¾–7⅞: one-size caps are out. Your choices narrow to a 59FIFTY in your exact size, Flexfit XL/2XL (limited colours), the Richardson 112 XL (top of its range), or a hat built big, like MONGO.
- 8: the 59FIFTY 8 and Flexfit XL/2XL are at their limits. Snapbacks from the big three won't close. MONGO is in the middle of its range here.
- 8⅛–8½: none of the three brands' published charts go this high. This is exactly what MONGO is for.
The other thing brand charts don't show is crown depth. A cap can technically close at your size and still sit on top of your head like a bottle cap. Adam B. told us another brand was "too shallow." MONGO hats have a deeper crown than standard caps, so they sit down where a hat should.
MONGO sizing
Both MONGO hats are snapbacks with an extended-range closure, built for hat sizes 7½–8½ (23.6–26.7 in / 60–68 cm):
- XL Performance Snapback 2.0, $59.99, 7 colours
- XL Foam Trucker, $44.99, Black or Green/Black
Free US shipping, 30-day fit guarantee (we cover return shipping if it doesn't fit), and bundles of 2 for $99 or 3 for $139. Shop hats for big heads or check your size with the hat size calculator.
Fitted hat size FAQ
What is the biggest New Era 59FIFTY size?
New Era's official 59FIFTY chart lists sizes up to 8, which is a 25-inch (63.5 cm) head.
What size is a Flexfit L/XL in fitted sizes?
Flexfit's spec sheets list L/XL as hat sizes 7⅛–7⅝ (22⅜–23⅞ in head circumference).
What size does the Richardson 112 XL fit?
Richardson's published sizing puts the 112 XL at about 7¼–7⅞, topping out around a 24⅝-inch (63 cm) head. The standard 112 is about 7–7¾.
Do fitted hat sizes run the same across brands?
Fitted number sizes are close across brands because they all come from the same formula (head circumference ÷ π). Letter sizes like L/XL vary a lot: New Era's L/XL starts where Flexfit's ends.
What hat brands make sizes bigger than 8?
None of New Era, Flexfit or Richardson's published charts list a size above 8. MONGO snapbacks fit up to 8½ (26.7 in / 68 cm).