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Material not-withstanding one of the features I usually look for in good outdoor pants is a gusseted crotch.
As demonstrated by this very simple yet still disturbing illustration.
Allows for a little better range of motion and your pants don't bunch up around your juevos on a long or hilly kike.
I've got several different /out/ pants, from REI synthetic to Orvis wool to just plain old surplus fatigues but they've all got a gusseted crotch.