Free Domestic Shipping On Orders Over $55


Louis Garneau Diamond Helmet





The Diamond Helmet represents Louis Garneaus greatest achievement in helmets. Through patented technology, they have unleashed an absurd amount of ventilation while still meeting safety standards. Worn by Chrissie Wellington in her record-setting 2009 Ironman World Championship title. Available here first at


  • Weight: 10.1 oz./285 g
  • Certifications: CPSC-ASTM-CEN
  • Vents: 40
  • Super MSB Technology
    Ring-shaped plastic cover at the base of the helmet in order to spread the shock of impact
  • Exo-Insert Technology
    Inner plastic cover to reinforce the helmet structure
  • In-Mold Construction
    Industrial process binding the microplastic and polystyrene together to add superior mechanical properties to these materials
  • Spiderlock Elite
    Adjustable and detachable rack-and-pinion mechanism using only one hand to stabilize the helmet on the head. It is provided with ergonomic padding
  • Composite Reinforcement
    Inner composite-made frame which spread the shock of impacts. It provides support and protection while being lightweight.
  • Steplock Side Adjustment
    Cam locking device to quickly adjust strap position
  • Sealed Airdry padding
    Sealed adjustment padding for enhanced durability, ergonomic design for optimum comfort, and is washable.
  • Evacuation channels
    Moisture channels providing better airflow and moisture wicking
  • S: 6 1/2-7, 20″ 1/2-22″, 52-56 cm
  • M: 7-7 3/8, 22″-23″ 1/4, 56-59 cm
  • L: 7 3/8- 7 3/4, 23″ 1/4- 24″ 3/8, 59-62 cm

Price match guarantee

We'll match any competitors price

Free ground shipping

On orders over $125

60-Day return policy

Zero hassle. No questions asked.

Weekly Email Specials

Sign up for exclusive deals delivered via email