RAW INSEAM: If it says in the Product Description that the pants have a Raw Inseam Length of 34", it means those particular pants do not automatically come hemmed, and that the full inseam length is 34" prior to that being done. Pants with a Raw Inseam Length are great because you can have them hemmed to fit you perfectly, but that is your responsibility to have done.
FIXED INSEAM: If the Product Description says that these pants have a Fixed Inseam Length of 34", it means that these pants already come hemmed. So if you're lazy, like me, you won't have to do anything with these when you get them. Except put them on, of course.