Tech drop3 weeks ago
Castelli Perfetto 4 drops ventilation zips, adds insulation after riders complained
New AirCore fabric weight219g, more loft than Perfetto RoS 3
Temperature range4-12°C
Ventilationzippered vents removed, breathability handled by AirCore membrane alone
Line structuresplit into Perfetto 4 and Perfetto Pro
The Perfetto RoS 3 launched in 2025 as Castelli's bet that a PFAS-free Polartec AirCore membrane could replace Gore-Tex Infinium without sacrificing performance. Customers pushed back: too light, not enough warmth for the jacket's own name. Castelli's answer isn't a patch — it's a split line, with Perfetto 4 getting a heavier 219g AirCore weave for everyday cool-weather riding, while Perfetto Pro presumably keeps the racier profile. Dropping the zippered vents entirely is the tell here: Castelli is betting the membrane's breathability alone can manage heat, a call it wouldn't have made on the original AirCore fabric.
Sources
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