Well, saddles (both mens and womens) can come in different widths. Generally, if you took a tape measure to the underneath side of the fullest part of the saddle in the back it should equal the stated width. The Specialized sitz tool measures your bone width by where the dents hit center. From there, I know they have a chart based upon your riding position of what width of saddle they feel would work best for you. What actually does work best for you, or in another brand of saddle, may vary. But, it is a guide. You can also measure your sitz bones at home too. There are some threads on here specifically about that. Basically, you roll out some playdough or the like and do your own sitting and measure of the dents. Good Luck.
EDIT:
http://www.specialized.com/specs/spe...&cellwidth=350
Hopefully if this link will work, this is the Specialized guide of what I'm talking about. If the link flakes out, try googling to get it. For me, I'm 140. If you scroll down and look at the chart, in an aero position, they say I should have a 143. More upright, 155. The shop recommended I go with 143. It depends what you're comfortable with in the end. But, do notice in the link example the pic of the saddle laid out... the measurement of the width is as I say... also how you would measure any other saddle (widest point to point) IMHO.



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