Boots are one place where I don't skimp and they are not one size fits all. You really need to try them on to see which fit your feet best. Kentetrek, Crispi, Zamberlan, Schnee's, all make great boots but they'll all fit differenty. I've settled on Zamberlans for my foot and have insulated and uninsulated pairs. For superlight boots in relatively easy country, I will wear Salomon 4D 3 GTX's. If it will be cold, I have gone to a combo of liner sock with heavier wool sock and then some toe warmers.