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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

End FAQ

 

 

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)
G
check-mark check-mark check-mark check-mark check-mark
Watts
check-mark check-mark check-mark check-mark

Brentwood check-mark check-mark check-mark check-mark check-mark
Baker
check-mark check-mark check-mark check-mark

Macon
check-mark check-mark check-mark check-mark check-mark


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)
Cougar check-mark check-mark check-mark check-mark

Berkeley check-mark check-mark check-mark check-mark

Muse check-mark check-mark check-mark
Brighton check-mark check-mark check-mark check-mark

Brighton H2O check-mark check-mark check-mark check-mark



Bern Junior Helmet Sizing (Adjustable)

Size
(Centimeters)
XS - S
(48 - 51.5)
S - M
(51 - 54.5)
Girl Helmets check-mark check-mark
Boy Helmets check-mark check-mark

 

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		SML 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		SML 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

 

End FAQ
 
 
 
 
 

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