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Klim F5 Koroyd Chasm ECE Helmet

Built on the F5 chassis and adding to its engineered capability to provide all-day comfort, the Klim F5 Koroyd Helmet adds the next level of safety and ventilation technologies to provide an unprecedented combination of protection, reduced weight and enhanced ventilation and carries the DOT certification for on-road use.

Koroyd is a next generation energy absorbing technology, engineered with a unique structure which reduces trauma levels with innovative energy management properties. When impacted the Koroyd cores crush homogeneously, decelerating the energy from the impact and reducing final trauma levels. MIPS brain protection system is a low-friction layer designed to reduce rotational motion transferred to the brain from angled impacts the head.


  • Full Klim Karbon fiber shell
  • 3 shell sizes and 3 dual density EPS sizes
  • Hybrid impact protection combines multiple energy absorption technologies
  • Koroyd technology
  • MIPS technology
  • Extra large eye port for maximum field of vision
  • Fid-lock strap closure
  • 18 intakes and 8 exhaust vents
  • Direct vent EPS design, designed to intake air at speed / exhaust heat while at low speeds or stopped
  • Neck brace compatible
  • Moisture-wicking Drylex comfort liner with anti-microbial and anti bacterial materials
  • Includes helmet bag, breath box, windstopper liner, extra peak and hardware
  • DOT and ECE certified
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Product Style Item # Store SKU Manufacturer Product # Availability
Product Style Orange / SM Item # 1277400 Store SKU Manufacturer Product # 3992-000-120-002 Availability Out of Stock
Product Style Orange / MD Item # 1277402 Store SKU Manufacturer Product # 3992-000-130-002 Availability Only 1 Left: Ships within 24 hours
Product Style Orange / LG Item # 1277404 Store SKU Manufacturer Product # 3992-000-140-002 Availability Out of Stock
Product Style Orange / XL Item # 1277406 Store SKU Manufacturer Product # 3992-000-150-002 Availability Out of Stock
Product Style Orange / 2XL Item # 1277408 Store SKU Manufacturer Product # 3992-000-160-002 Availability Out of Stock
Product Style Orange / 3XL Item # 1277410 Store SKU Manufacturer Product # 3992000170002 Availability Out of Stock