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

We set out to create the perfect winter cycling jacket, with the sole goal of making the best possible jacket using the finest fabrics and an innovative structure that guarantees 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 W Jacket is made with Castelli's exclusive Polartec® AirCore™ fabric for unmatched breathability, without sacrificing wind and rain protection. The internal Polartec® Alpha® insulation of the Alpha 150 Jacket ensures warmth and better 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 can handle everything except all-day driving rain, in which case you'll 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.