I am gearing up (literally) for a Mount Rainier climb in mid-July. I plan more climbs, so I am going to purchase plastic mountaineering boots. I have tried Koflach Degre (red) and Asolo Evoluzione (blue)boots. The Asolo's felt better on my feet. Does anyone know the difference between the Asolo Evoluzione (blue) and Asolo Guida (yellow) boots? Recommendations? Thanks.