A few have found they run about a half-size small and may require a longer breaking-in period than other comfortable shoes, so you don't want to buy them just before your big hike or vacation.
The thickness of these socks could actually require you to go up a size or half-size with the boot you want to buy.
The sizing is also clearly specified for most shoes; it is noted when sizes run a half-size bigger.
You might have to go up or down a size or half-size from your usual shoe size with hiking boots.
All you need is a room about the half-size of a regular indoor gym.