The Alpha 150 Jacket is the ideal jacket for the entire winter. Comfort. No compromises.

We set out to create the perfect winter cycling jacket, with the sole objective of making the best possible jacket using the best fabrics and an innovative structure, guaranteeing comfort in the most disparate conditions, including cold and humidity. The Alpha 150 is the result of 12 years of continuous refinement of a concept designed to keep you warm and dry, both outside and under the jacket.

New for 2025, the Alpha 150 Jacket is made with the exclusive Polartec® AirCore™ Castelli: a windproof and waterproof fabric with unbeatable breathability. The internal Polartec® insulation of the Alpha 150 Jacket guarantees warmth and superior breathability. Thanks to the close fit, you won't even notice you're wearing a winter jacket.

This jacket is ideal for cold, dry days and is able to withstand everything, except for all-day driving rain, in which case you will probably need to resort to a rain shell. The use of recycled yarns and the absence of PFAS are additional features that make this winter jacket the best ever made by Castelli.