Join Date: Jan 2006
Location: Colorado Springs
Bikes: Surly Crosscheck
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As Threephi said, seat width is a function of position. The more upright you are, the more weight on your butt and the more support you need there in the form of a wider saddle. The more leaned forward you are, the more aerodynamic you become, the less weight on your butt (and more on your hands--and actually on your feet) and a narrower saddle becomes appropriate.
I have a fairly wide seat on my bike because I sit pretty upright. If I lean forward into more of a racing position I can feel the width get in the way.
So you need to assess what style of bike you have and your position. Too wide a seat can lead to leg problems if you are whacking the back of your legs constantly.
One other thing is softness. People often go for squishy, soft seats thinking they'll be more comfortable, and they are--for the first 15 minutes. Anything longer and soft seats usually become quite uncomfortable. Firmer seats allow you to rest on your sit bones, which are designed to support our weight. Soft seats let you sink in and put pressure on soft tissues--nerves and other delicate bits--and this will cause problems.