“The use of Koroyd technology in this new F5 actually adds to all three of the features mentioned above. Constructed from sections of welded tubes, Koroyd claims its material provides 48% more energy absorption than other standard EPS style foam liners on the market.
The Koroyd tubes work extremely well for ventilation. A key element of the F5 in its original iteration was to provide ample venting to allow heat to escape while working in more technical terrain at lower speed. Koroyd takes this to a new level.
While moving, the helmet expels heat with the best of them, but its while working hard in tight terrain and while stopped that the F5 shines. It instantly flows heat from the back and top of your head through the vents and welded tubes to provide excellent heat dissipation in hot climates."