SITERO EXPERT Tri-Saddle

The first thing you may notice about the Sitero is what makes it look different from other popular split-nosed saddles, which is how fast it tapers at the front. That makes is appear narrower than it is.  Specialized quite correctly designates a "sit zone" the portion of the saddle on which you're actually meant to put your sit bones and it's clearly defined by the portion of the saddle with the small dot perforations in the upper surface. For fit purposes, this is the only section that really matters; you don't put your but aft of that section, and nothing fore of it gets much pressure because of how short it is.

The detachable Tri Pod accessory lets you mount a single rear cage.
So, about those accessories I just mentioned. Specialized designed the saddle with two different parts that bolt in beneath the tail of the saddle. The first is a hook-like piece is meant to help you rack your bike in transition, so that your bike hangs from the rear end of the saddle. This makes for snappy-fast transitions, and minimizes the chance that you'll knock over a competitor's bike on the way out.  Specialized has a great answer for this in the second accessory, the Tri Pod. This part replaces the hook, and provides a standard set of bottle bosses with which you can bolt a single rear cage.  It's a lovely solution. Both accessories are included free with every Sitero

(bottle cage and C02's not included)