Stealth Helmet Liner
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Stealth Helmet Liner


The GameBreaker Stealth Helmet Liner is a helmet insert fully powered by an innovative smart molecule technology. D3O® materials flow freely when at rest, but on impact, lock tightly together to disperse and absorb the energy of the blow, before instantly returning to their soft, flexible state. This reaction is instantaneous and 100% passive. The greater the force of impact, the greater the protection. The liner has the ability to reduce the SI (severity index) while fitting comfortably inside all helmets, caps, or beanies.

  • Powered by D3o
  • Full Head Coverage
  • One Size Fits All
  • Ventilated For Max Air Flow
  • No Metal or Hard Plastic Component Parts

The GameBreaker Stealth Helmet Liner reduced the severity index across all four testing zones: Rear Boss, Front Boss, Front, and Side*. The performance of two national brand hard shell helmets was increased by up to 17% in high and low velocity impacts when compared to the helmets effectiveness alone. *see graphic below


The GameBreaker Stealth Helmet Liner is a universal, one size fits all product. Easily trim off any unwanted excess D3O® with any pair of scissors. Fits helmets, caps, and beanies.





Learn more about how D3O® is helping GameBreaker to Protect the Player by clicking over to our D3O® page.

Additional information

Weight 0.25 lbs
Dimensions 15.0 × 13.0 × 0.5 in