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Klim F5 Ion ECE Helmet


Ride all day in comfort in the Klim F5 ECE Helmet. The Klim Karbon fiber shell is one of the lightest out there, reducing fatigue.


Klim F5 Ion ECE Helmet

The Klim F5 is the ultimate all-day off-road helmet, designed 100% from the ground up with Klim’s legendary rugged quality and careful attention to years of rider feedback. Meticulous test data and cutting-edge construction technologies come together to make the revolutionary F5 one of the lightest weight and most comfortable dirt bike helmets on the market. Combining extremely low weight, intuitive venting and next-generation safety features, Klim has engineered the F5 to provide the best possible riding experience in the most demanding environments, all day.

Note: This is an ECE rated helmet. The F5 is not DOT approved.


  • Full Klim Karbon fiber shell
  • One of the lightest helmets in the industry
  • Extra large eye port for maximum field of vision
  • Dual density EPS
  • Wind tunnel tested
  • Fid-lock strap closure



Klim Helmet Sizing


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:

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

  • 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.

Additional information


Red, Green


MD, LG, XL, 2XL, 3XL


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


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