For the uninitiated, Castelli had the bright idea of stitching the back half of their highest-end Body Paint bibs (shorts, really, as the bib straps are discarded) to an aero jersey. This gives you the seamless back of a skinsuit, three pockets that actually work, and the ability to unzip your jersey all the way without sending everything in said pockets flying across the road. In essence, a high-end skinsuit that can be used for a road race, a longer XC race, or (insert 2+-hour-long cycling activity here). Castelli is already starting with the best kit in the business here. The Body Paint shorts are solid - comfortable chamois and no annoying silicone gripper. The jersey that they use for the suit is definitely lighter weight than your average race kit. The back and most of the sleeves are a light poly material that breathes extremely well (not for cold weather). The front is a similar lycra to that used in their skinsuits. Put together, the suit forms a combination that's more comfortable than the bibs and jersey separately.
Did I mention this thing is tight? More form-fitting than most people are used to in public. One has to wiggle in and out of it, a pretty funny sight in the race staging parking lot. You can see most of my scars through it. You can see my teammates' tattoos* through theirs. If I had to take an unscientific guess, most of those watt savings that Castelli claims are from The Tightness, not aero dimples or fabric choice. On the Race Weight scale from Sumo Wrestler Attending Bicycle Classes to The Schon, it's going to fit the 6 foot 130 pound rider best. But this is a good thing. There's no slack in the shoulders, nothing for the saddle to snag on CX or MTB remounts, and it generally makes us really really good looking (when at race weight). The only summer races for which I might skip the speedsuit would be ones where I could reasonably expect to crash, like Gnar Weasels or the Harlem Cat 2/3 crit**, only because they're somewhat pricey and can't be replaced one piece at a time like damaged jersey/bibs. If we could change anything, it would only be for Castelli to make a lady-specific version of the Sanremo. Our female racers, who tend not to resemble the human skeletons the suit was originally tested on, found the speedsuit too tight in front and too baggy in back.
* Not actually a teammate's tattoo.
** I'm never going back to Harlem YOU CAN'T MAKE ME.
Kevin forgot to turn his #13 plate upside down.