All the Keen shoe's I've bought have been...
All the Keen shoe's I've bought have been true to size. Why does this run small? Aren't they all built on the same last?
It runs small for two reasons.
One, this has KEEN dry in it, when this is used there is less room due to the foam layer that protects the membrane.
Two, KEEN made the Alamosa with less volume across the top in the forefoot of the shoe for higher performance when fast hiking.