Castelli's Aero Race 8S Jersey is the eighth generation of the brand's flagship aero race jersey, and it's the one you see under WorldTour numbers when the road tilts up and the pace turns ugly. The fit is full-on race cut — close to the skin from collar to hem, with no extra fabric to flap in the wind at 50 km/h. If you've been riding Castelli's race jerseys for a while, this is the snuggest one yet.
The story here is fabric placement. Castelli uses Velocity Light on the front and shoulders, a four-way stretch knit that hugs the chest without choking it, while the sleeves get the Aria mesh treatment — that perforated stretchy stuff that locks onto your arms and smooths airflow across the bicep and tricep. The back panel is Prosecco Strada, a breathable mesh that dumps heat on hot days and keeps you from cooking on summer climbs. Three fabrics, each doing one job, and the seams are placed where they won't catch wind.
The collar sits low and soft so it doesn't bunch under a chinstrap or rub on a hot day. The full-length YKK Camlock zipper stays put when you want it to and runs smoothly when you're peeling it open at the base of a climb. A silicone gripper at the hem keeps the jersey locked down over bib shorts, and the three rear pockets handle a full ride's worth of bars, gels, a phone, and a rain shell without sagging.... Read More
Pick this one if you race, do fast group rides, or just like wearing what the pros wear. If you prefer a more forgiving cut, look at the Entrata or Endurance jerseys instead — the 8S is unapologetically race-fit and assumes you're okay with that.
