Skip to Main Content
Free Shipping
over $39.99

Orders $39.99 or more ship free within the contiguous U.S. and to Alaska, Hawaii and Puerto Rico

Free Shipping Policy

Doesn't fit? Don't love it?

Return any unused item within 90 days for a full refund.

Start a Return
Read our full Return Policy
Lowest Price,

Found it for less?

RevZilla will match any advertised price on new merchandise available through another authorized U.S. dealer.

Submit a Price Match

Elite Service Rating

Our goal is to provide the best possible shopping experience to every enthusiast who visits RevZilla.

See what our customers are saying about us:

Customer Reviews

ZillaCash Rewards Program

Earn $5 for every qualified $100 you spend. You'll also hear about special offers and events! How it works:


Sign in or create an account to earn ZillaCash on your next purchase with us.


Earn $5 for every $100 you spend on eligible items and brands.


Redeem your ZillaCash Rewards on a future order with us!

See our customer service page for more details.

We have updated our Privacy Policy. Please click here to review the updates.Accept
Staff Pick

Klim F5 Koroyd Chasm Helmet

Item: P399706
1 Read 1 Review 2 Q&As Write a Review

The Klim Karbon fiber shell is one of the lightest out there, reducing fatigue. MIPS and Koroyd tech provide head safety. Read More

Rebate Available! View Details

Product Details

Klim F5 Koroyd Chasm ECE Helmet

Koroyd cores crush homogeneously when impacted slowing the energy from the impact which reduces trauma. MIPS handles any rotational forces from angled impacts. Numerous intake and exhaust vents makes sure you are cool zipping down a fire road or crawling through a technical trail. Its Klim Karbon Fiber Shell provides strength while still remaining lightweight so you can reduce fatigue over time. Massive ventilation, lightweight shell and unique protective features set the Klim F5 Koroyd helmet apart from other off-road lids that lack new technology.


  • 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
Product Style RevZilla Item # MFR. Product # Availability
Product Style Orange / SM RevZilla Item #1277400 MFR. Product #3992-000-120-002 AvailabilityOut of Stock
Product Style Orange / MD RevZilla Item #1277402 MFR. Product #3992-000-130-002 AvailabilityOnly 1 Left: Ships within 24 hours
Product Style Orange / LG RevZilla Item #1277404 MFR. Product #3992-000-140-002 AvailabilityOut of Stock
Product Style Orange / XL RevZilla Item #1277406 MFR. Product #3992-000-150-002 AvailabilityOut of Stock
Product Style Orange / 2XL RevZilla Item #1277408 MFR. Product #3992-000-160-002 AvailabilityOut of Stock
Product Style Orange / 3XL RevZilla Item #1277410 MFR. Product #3992000170002 AvailabilityOut of Stock

Klim Helmet Sizing

Size Head (cm)
XS 52-53
SM 54 - 55
MD 56 - 57
LG 58 - 59
XL 60 - 61
2XL 62 - 63
3XL 64 - 65

 TK1200 and K1R Helmets:

Size Head (cm)
SM 55 - 56
MD 57 - 58
LG 59 - 60
XL 61 - 62
2XL 63 - 64

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

How to Measure

  • H Head
    Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, repeat for good measure and use the largest measurement.
Product Description
Part Numbers
Sizing & Fit
1 Customer Reviews
2 Questions & 2 Answers

Related Videos

Thumbnail for Best Motorcycle Helmets 2019

Best Motorcycle Helmets 2019

Thumbnail for How To Size and Buy a Motorcycle Helmet

How To Size and Buy a Motorcycle Helmet

Reviews & Questions

Leave a product review for a chance to win one of our monthly $100 giveaways.
Ask or answer a question to win one of our monthly $100 giveaways.