Fitting and adjustment
The One K helmets are available in 3 shell sizes. By using the One K foam liners you can achieve the perfect fit. This system allows the helmet to grow with the young rider. One K helmets are available in 2 shapes, Regular and Long Oval which emphasizes an elongated head from front to back and slightly narrower measurement from side –to – side.
Wearing the wrong shaped or size helmet can lead to increased pressure and discomfort. One K has options for perfect the fit. Please note that both Regular and Long Oval shaped helmets use the same liners. Shape is determined by shell, not the liner.
HELMETS SIZE CHART
| Helmet Size | Centimeter Measurement | Hat Size |
|---|---|---|
| X-Small | 51 - 52 cm | 6 3/8 - 6 1/2 |
| Small | 53 - 54 cm | 6 5/8 - 6 3/4 |
| Medium | 55 - 56 cm | 6 7/8 - 7 |
| Large | 57 - 58 cm | 7 1/8 - 7 1/4 |
| X-Large | 59 - 60 cm | 7 3/8 - 7 1/2 |
| XX-Large | 61 - 62 cm | 7 5/8 - 7 3/4 |
Junior HELMETS SIZE CHART
| Helmet Size | Centimeter Measurement | Hat Size |
|---|---|---|
| X-Small | 47 - 48 cm | 5 7/8 - 6 |
| Small | 49 - 50 cm | 6 1/8 - 6 1/4 |
| Medium | 51 - 52 cm | 6 3/8 - 6 1/2 |
One K™ liners
Instantly refresh your helmet with the One K removable and washable One K liners. Available in XS – XXL and One K Junior liners are available in XS – M. One K Liners are the easy way to refresh your helmet or size up or down for a helmet that doesn’t quite fit.
Helmet LINERS CONVERSION chart
| Stock Helmet | Can change helmet to: | By replacing with liner sized: |
|---|---|---|
|
X-Small (6 3/8 - 6 1/2") |
Small Medium |
Small Medium |
|
Small (6 5/8 - 6 3/4") |
X-Small Medium |
X-Small Medium |
|
Medium (6 7/8 - 7") |
X-Small Small |
X-Small Small |
|
Large (7 1/8 - 7 1/4") | No size conversion available | |
|
X-Large (7 3/8 - 1 1/2") | XX-Large | XX-Large |
|
XX-Large (7 5/8 - 7 3/4") | X-Large | X-Large |
JUNIOR Helmet LINERS CONVERSION chart
| Stock Helmet | Can change helmet to: | By replacing with liner sized: |
|---|---|---|
|
X-Small Junior (5 7/8 - 6") |
Small Junior Medium Junior |
Small Junior Medium Junior |
|
Small Junior (6 1/8 - 6 1/4") |
X-Small Junior Medium Junior |
X-Small Junior Medium Junior |
|
Medium (6 3/8 - 6 1/2") |
X-Small Junior Small Junior |
X-Small Junior Small Junior |
