Sizing is small

I purchased three pair of the Nevada Legend GTX boots from Crispi for an out-of-state hunting trip. I ordered the size I wear, but the boots are at least a half size smaller than the size says. The boot size runs small. I like the boots though, and they are comfortable to wear even if they are too tight. I'm going to buy another pair, because these are good boots. I'll just buy a bigger size.