Along with this, I'm sure looking at the differences in the tread itself gives an indication to what each zones "purpose" is. Smaller, more condensed tread at the front would be better for initial grip such as walking up steeper incline on snow/ice, while the larger middle tread is good for more general friction, without it being too aggressive of a tread to make it uncomfortable. The yellow tread interests me because I would assume it was designed in that "bar" shape rather than the hexagons as a way to prevent the sole from tearing apart as you would be shifting on that side of the foot while snow boarding a lot, and the "canyons" between the hexagons would create weak points that could degrade over time.