Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
I love my Klim F4 and it works with 509 goggles, both Sinister X5 and Aviators wonderfully.
I do have two 509 Altitude helmets on order however, one for my wife and I, to try out this season. I can take some comparison pics and such if you would like, once the new helmets arrive.
A comparison picture would be much appreciated.......I've heard from a few people I ride with that the F4 is stupid cold even with the liner in. Any thoughts? The snow specific features on the 509 make it look pretty enticing along w/ the lower price.
Remember.
KLIM makes TWO varients of the F4 helmet.
The SNELL 2010 and the ECE.
The ECE is much lighter in weight.