Castelli’s new aero Unlimited Skinsuit isn’t the first gravel racing onesie isn’t the first to integrate a sleeve for a hydration bladder on your hot, sweaty back. But together with its Rosso Corsa companion aero Unlimited Pro 2 Jersey for men & women, Castelli now offers more hydration-equipped options to boost your gravel racing aerodynamics than any other clothing maker.
Castelli Unlimited gravel racing skinsuit & Pro 2 jerseys
Whether you agree with Rule #32 or not, it’s clear that staying fueled and hydrated is a challenge for the longest, most intense gravel races. Many racers wear hydration vests to haul enough water and snacks. And we’ve reviewed the best ones out there. But many racers have looked for a lighter, more integrated, and more aero solution.
And Castelli’s solution is to combine their top-tier aerodynamic fabric and cut of their road-racing Rosso Corsa skinsuit & jersey designs with a small mesh hydration bladder sleeve integrated high on the back. The result is easy-access storage for an extra 1.5L of water, improved rider aerodynamics creating an effective cowl tucked behind your helmet, and still a standard 3+1 pocket layout for your regular needs.
Unbound XL-proven
Castelli-sponsored gravel racer Rob Britton wore a prototype of this to his 2025 Unbound XL win last summer – interestingly, where Lachlan Morton was riding with extra water in an aero bikepacking bag under his aero bars, not in the Blaerosuit he helped Rapha develop the year before.
“I received the Unlimited Speedsuit the day before Unbound, and as well as fitting really well, the leg pockets worked a charm – nothing moved around – and the hydration pocket was dialed. I was also able to replace the bladder quickly during the race… My favorite thing about this suit is that it’s comfortable, as well as being super fast. I’ve used it in nearly every race since my Unbound win, and it’s definitely progressing what’s possible in gravel racing.”
– Rob Britton of the Castelli Spirit of Gravel Cabal race team
Tech details
- Unlimited Speedsuit & Unlimited Pro 2 Jersey share the close-to-body, aerodynamic upper construction
- highly breathable Air_O Stretch main body fabric
- UPF 30 sun protection blocks 97% of all UV rays
- CFD-optimized shoulder fabric and seam construction to reduce drag
- mesh hydration pocket for 1.5L bladder, plus shoulder & side webbing hose routing loops
- 3 open lower rear pockets, plus 1 zip security pocket
- continuous printed-on silicone grippers
- Unlimited Speedsuit includes special gravel race lower half based on their road Free Aero Race S Bibshorts
- made from aerodynamic Forza2 Stretch fabric, delivering a 3% decrease in CdA
- Progetto X2 Air Seamless seat pad for all-day comfort
- nutrition cargo pockets on the top of each thigh for easy access without the added drag of side cargo pockets
Castelli Unlimited – Pricing, options & availability
The new Castelli gravel racing Unlimited Skinsuit is available now for $420 / £360 / 350€ in a unisex fit and sizing, in just two color options. Pick from Vivid orange + Hot Sauce red for the skinny adventurous racers among us, or a more sensible Mango Mojito yellow + black bibs.
For a bit more everyday practicality, the new Castelli Unlimited Pro 2 gravel racing jersey is offered in both men’s & women’s fits for $230 / £189 / 180€. Men get the choice of 3 colors – Elmwood tan, Paprika red, or classic black.
Women get 2 color options – the same Paprika red, or a patterned Forest green and Elmwood tan design with Vivid orange hydration pocket and detailing.
