One K Helmets


Sizing Chart:
Extra Small: 51-52cm or 6 3/8-6 1/2
Small: 53-54cm or 6 5/8-6 3/4
Medium: 55-56cm or 6 7/8-7
Large: 57-58cm or 7 1/8-7 1/4
Extra Large: 59-60cm or 7 3/8-7 1/4
Extra Extra Large: 61-62cm or 7 5/8-7 3/4

Re-fit/Replacement Liners
Defender helmet liners are available separately. You can instantly refresh your helmet with a new liner and you can even change its size! Here's how it works: Two shells make up all sizes. The base shells are medium and large. Use a medium size helmet with a small or extra small liner to change the fit to small or extra small. Use a large size helmet with an extra large or XXL linet to change the fit to XL or XXL.

Sizing Chart:
Extra Small: 51-52cm or 6 3/8-6 1/2
Small: 53-54cm or 6 5/8-6 3/4
Medium: 55-56cm or 6 7/8-7
Large: 57-58cm or 7 1/8-7 1/4
Extra Large: 59-60cm or 7 3/8-7 1/4
Extra Extra Large: 61-62cm or 7 5/8-7 3/4

Re-fit/Replacement Liners
Defender helmet liners are available separately. You can instantly refresh your helmet with a new liner and you can even change its size! Here's how it works: Two shells make up all sizes. The base shells are medium and large. Use a medium size helmet with a small or extra small liner to change the fit to small or extra small. Use a large size helmet with an extra large or XXL linet to change the fit to XL or XXL.Product Image
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