From the Specialized site...
BG® saddle designs take the pressure off your important parts, so the terms "saddle" and "sore" can remain exclusive.
We follow the doctor's orders when it comes to saddle design because hours on a bike will quickly prove that an ill fitting or poorly designed saddle is, well, pure hell. Ergonomic designer and medical doctor Roger Minkow was the first person to present solutions for saddle pressure/dysfunction, and he helped us develop the specific shapes, contours and cut-outs you’ll find in all of our Body Geometry saddles.
Though years in the saddle may have given you an opinion or two about what feels best, we always suggest getting fit to your bike. Your local Specialized dealer can either guide you through a comprehensive BG FIT session, or if saddles are your only concern, they can measure your actual sit bone width to find the perfect fitting saddle (all models are available in multiple sizes) for your body.