Selle Italia call this an 'active saddle'. What that means in terms of design is that the Vanadium steel rails are mounted into elastomers rather than directly to the saddle's shell. This allows a certain amount of rotational flex, and also provides a bit more suspension than a rigid-bodied saddle. The saddle is supposed to adjust itself to your seating position to relieve any pressure points.
Certainly it's a comfortable perch, though as always with saddles it's difficult to know if that's the technology doing its job, or simply that it's a good fit for my behind. The flex is noticeable but not disconcerting, and the combination of the firm padding and elastomer suspension does a good job of smoothing out road shocks on longer rides. There's a hole in the middle to ease pressure on your vitals, and you get a sort of seat condom to cover said hole on wet days. Its ability to adjust means it's definitely one to try if for any reason you have an uneven pedalling style, or you tend to sit slightly askew on the bike - because of hip, ankle or knee problems, for example.