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Helmet Sizing Chart
Heads come in all shapes and sizes and there is no such thing as an average helmet size so it is important for our customer's to feel confident that they are ordering a helmet that will fit well. Choosing the correct size will give you seasons of wearing comfort and pleasure.
Helmets are sized to the nearest whole numbers; it is advisable to size up if your head falls between two measurements.
Click on the appropriate section or helmet manufacturer below for specific sizing instructions.
Helmet measuring for all ages
Measuring your helmet is important to comfort and safety. Please measure to ensure the helmet you purchase will provide the highest degree of safety and comfort it can possibly provide.
Size matters! Helmet sizing varies, compare the measurement with our helmet sizing chart for accuracy, or feel free to call or email our knowledgeable helmet staff to help you with fitting your helmet.
Important! Please do not guess or use past helmet purchases as a guide for this purchase. Although we are happy to exchange, we hope your helmet will be a great fit the first go around!
When you have all the measurements place your order!
Take your time, when you measure accurately you will be helmet happy – your happy helmet fit is our helmet happiness!©
It is helpful to have someone measure your head circumference. For the greatest accuracy and comfort, follow these simple helmet measuring tips.
Sizing up your helmet!
- Measure the circumference of the head using a cloth or paper measuring tape, string, shoelace, ribbon, or a strip of paper
- Place your measuring device approximately one inch (about 2.5cm) above the eyebrows, above the ears and around the back point of the head where the results provides the largest measurement. Be sure to take the reading OVER your hair, unless you are going to cut it all off before you wear the helmet.
- Please take this measurement a few times to ensure accuracy.
- Grip the measured location with your fingers and read the number (be sure to read to at least 1/8” or ½ cm.) If you are using a string or paper, lie on the table and measure the length with a ruler. Please repeat this process until you are happy you have measured correctly. To convert inches to centimeters by multiplying your measurement by 2.54 (example 28 inches = 28 X 2.54 cm.)
- It can be difficult to determine if the helmet measurement is between sizes. One option is to choose the next larger size as padding can always be added to provide the perfect fit. The helmet should fit snug, but not overly tight. If you prefer a tighter fit choose a size down.1
- Compare measurement to our helmet sizing chart. Now you are ready to purchase your Allsportshelmet.com happy helmet!
- Match your inch or centimeter measurement to our helmet sizing chart above.
1Note about hair and helmet sizing: If you have a thick head of hair, or wear your hair pulled under your helmet or in a pony tail, you may want to consider ordering 1 size up from what is shown on the sizing charts...especially if you are near the top of your size range.
Getting the right helmet size is another step towards helmet happiness!
General Helmet Sizing
This general sizing chart are to be used as an aid in determining correct inches or centimeters.
| Helmet Size | Hat Size | Head Circumference (Inches) |
Head Circumference (Centimeters) |
|---|---|---|---|
| Small | 6 1/2 - 7 1/8 | 20.5 - 22.5 | 52 - 57 |
| Medium | 6 7/8 - 7 1/2 | 21.5 - 23.5 | 55-60 |
| Large | 7 1/8 - 8 3/4 | 22.5 - 24.5 | 57 - 62 |
| X-Large | 8 3/4 + | 23.5 - 25.5 | 62-67 |
General Youth Helmet Sizing
This general sizing chart are to be used as an aid in determining correct inches or centimeters.
| Helmet Size | Hat Size | Head Circumference (Inches) |
Head Circumference (Centimeters) |
|---|---|---|---|
| Extra Small | 6 1/8 - 6 3/8 | 19 - 19.50 | 49 - 50 |
| Junior Small | 6 3/8 - 6 1/2 | 20 - 20.25 | 51-52 |
| Junior Small / Medium | 6 7/8 - 7 1/2 | 21.50 - 23.50 | 57- |
Youth & Toddler Helmet Sizing
| Size (Inches) |
XS | S/M | L/XL |
|---|---|---|---|
| Youth Bike Helmet | 20 - 21 | 21.50 - 22.50 | 22.75 - 24.50 |
| Youth BMX Helmet | 21.50 - 22.50 | 22.75 - 24.50 | |
| Youth 12 Vent Bike | 22.50 - 23.63 | 23.63 - 25.75 | |
| Youth Ski Helmet | 20.50 - 22.25 | 22.25 - 23.50 | 23.75 - 24.50 |
| Toddler Helmet | 1 - 3 Years |
Brand Specific
The following are specific sizing instructions from many of the brands we carry. We hope this makes it easier to get the perfect fit for your new helemet.
Bern Helmets
Bern Men's Fit Systems
| Size (Centimeters) |
XS (52 - 53.5) |
S (53.5 - 55.5) |
M (55.5 - 57) |
L (57 - 59) |
XL (59 - 60.5) |
XXL (60.5 - 62) |
XXXL (62 - 63.5) |
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| Watts | |
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| Brentwood | |
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| Macon | |
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Bern Women's Fit Systems
| Size (Centimeters) |
XS (52 - 53.5 |
S (53.5 - 55.5) |
M (55.5 - 57) |
L (57 - 59) |
XL (59 - 60.5) |
XXL (60.5 - 62) |
XXXL (62 - 63.5) |
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| Cougar | |
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| Berkeley | |
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| Muse | |
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| Brighton | |
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Bern Junior Helmet Sizing (Adjustable)
| Size (Centimeters) |
XS - S (48 - 51.5) |
S - M (51 - 54.5) |
|---|---|---|
| Girl Helmets | |
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| Boy Helmets | |
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C.A.M.P. Helmets
| Model | Inches | Centimeters |
|---|---|---|
| Armour | 21.50 - 24.50 | 54 - 63 |
| Armour Lady | 21.00 - 24.00 | 53 - 61 |
| Armour Junior | 21.00 - 24.00 | 53 - 61 |
| Cosmic | 21.50 - 24.50 | 54 - 63 |
| Starlight | 20.00 - 24.00 | 51 - 61 |
| Startech | 20.00 - 24.50 | 51 - 62 |
| High Star | 20.50 - 23.50 | 52 - 60 |
Nutcase
Nutcase Street
| Sizing | Head Size (inches) | Head Size (centimeters) | Hat Size |
|---|---|---|---|
| Small/Medium | 20 1/2 - 23 1/2 |
52 - 60 |
6 1/2 - 7 1/2 |
| Large/Extra Large | 23 7/8 - 25 | 61 - 64 | 7 5/8 - 8 |
*Download PDF
Nutcase Snow
| Size | Head Size (inches) | Head Size (centimeters) | Hat Size |
|---|---|---|---|
| Small | 21 1/4 - 21 5/8 |
54 - 55 | 6 3/4 - 6 7/8 |
| Medium | 22 - 22 3/8 | 56 - 57 | 7 - 7 1/8 |
| Large | 22 3/4 - 23 1/8 | 58 - 59 | 7 1/4 - 7 3/8 |
| Xtra Large | 23 1/2 - 23 7/8 | 60 - 61 | 7 1/2 - 7 5/8 |
Nutcase Water
| Size | Head Size (inches) | Head Size (centimeters) | Hat Size |
|---|---|---|---|
| Small/Medium | 20 7/8 - 21 5/8 | 53 - 55 | 6 5/8 - 6 7/8 |
| Medium/Large | 22 - 22 3/4 | 56 - 58 | 7 - 7 1/4 |
| Large/Xtra Large | 23 1/8 - 23 7/8 | 59 - 61 | 7 3/8 - 7 5/8 |
Nutcase Little Nutty
| Size | Head Size (inches)> | Head Size (centimeters) |
|---|---|---|
| Xtra Small | 18 - 20 1/2 | 46 - 52 |
Toddlers to 5 years old: One Size fit all with a spin-dial fit system
*Download PDF
Pro-Tec Helmets
Men's/Women's/Youth Sizing
| Size (Centimeters) |
Junior Small |
Junior Medium |
S | M | L | XL |
|---|---|---|---|---|---|---|
| Pro-Tec B2 SXP | 51 - 52 | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 | |
| Pro-Tec Ace SXP | 51 - 53 | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 | |
| Pro-Tec Classic | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 | ||
| Pro-Tec Ace Wake | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 | ||
| Pro-Tec Ace Water | 49 - 50 | 51 - 52 | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 |
| Pro-Tec B2 Wake | 49 - 50 | 51 - 52 | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 |
| Pro-Tec Full Cut Water | S/M 53 - 56 | L/XL 57 - 58 | ||||
| Pro-Tec Ace 2 Face Water | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 |
Youth & Toddler Helmet Sizing
| Size (Inches) |
XS | S/M | L/XL |
|---|---|---|---|
| Youth Bike Helmet | 20 - 21 | 21.50 - 22.50 | 22.75 - 24.50 |
| Youth BMX Helmet | 21.50 - 22.50 | 22.75 - 24.50 | |
| Youth 12 Vent Bike | 22.50 - 23.63 | 23.63 - 25.75 | |
| Youth Ski Helmet | 20.50 - 22.25 | 22.25 - 23.50 | 23.75 - 24.50 |
| Toddler Helmet | 1 - 3 Years |
ProRider Helmets
Youth & Toddler Helmet Sizing
| Size (Inches) |
XS | S/M | L/XL |
|---|---|---|---|
| Youth Bike Helmet | 20 - 21 | 21.50 - 22.50 | 22.75 - 24.50 |
| Youth BMX Helmet | 21.50 - 22.50 | 22.75 - 24.50 | |
| Youth 12 Vent Bike | 22.50 - 23.63 | 23.63 - 25.75 | |
| Youth Ski Helmet | 20.50 - 22.25 | 22.25 - 23.50 | 23.75 - 24.50 |
| Toddler Helmet | 1 - 3 Years |
Smith Helmets
Smith Adult Helmet Fit System
| Size (Centimeters) |
|
|---|---|
| Small | 51 - 55 |
| Medium | 55 - 59 |
| Large | 59 - 63 |
Smith Holt & Maze Helmet Fit System
| Size (Centimeters) |
|
|---|---|
| X Small | 52 - 54 |
| Small | 54 - 56 |
| Medium | 56 - 58 |
| Large | 58 - 60 |
Smith Junior Helmet Fit System
| Size (Centimeters) |
|
|---|---|
| Youth Small | 48 - 53 |
| Youth Large | 53 - 58 |
Men's/Women's/Youth Sizing
| Size (Centimeters) |
Junior Small |
Junior Medium |
S | M | L | XL |
|---|---|---|---|---|---|---|
| Pro-Tec B2 SXP | 51 - 52 | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 | |
| Pro-Tec Ace SXP | 51 - 53 | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 | |
| Pro-Tec Classic | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 | ||
| Pro-Tec Ace Wake | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 | ||
| Pro-Tec Ace Water | 49 - 50 | 51 - 52 | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 |
| Pro-Tec B2 Wake | 49 - 50 | 51 - 52 | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 |
| Pro-Tec Full Cut Water | S/M 53 - 56 | L/XL 57 - 58 | ||||
| Pro-Tec Ace 2 Face Water | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 |
Triple Eight
Triple Eight Brain Saver Helmets
| Size (Inches) |
|
|---|---|
| X-Small | 20.1 - 20.5 |
| Small | 20.6 - 21.3 |
| Medium | 21.4 - 22.0 |
| Large | 22.1 - 22.9 |
| X-Large | 23.0 - 24.0 |
Triple Eight Water Helmets
| Size (Inches) |
|
|---|---|
| Small | 20.5 - 20.9 |
| Medium |
21.3 - 22.4 |
| Large | 22.0 - 23.2 |
| X-Large | 23.2 - 24.0 |
Triple Eight Snow Helmets
| Size (Inches) |
|
|---|---|
| Small | 20.5 - 20.9 |
| Medium | 21.3 - 22.4 |
| Large | 22.0 - 23.2 |
| X-Large | 23.2 - 24.0 |
Viking Helmets
| Age | Inches | Centimeters |
|---|---|---|
| Adult | 22 - 25 | 60 - 63 |
| Youth | 19 - 22 | 48 - 56 |
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