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The best cold-weather jacket. The Polartec® AirCore™ outer layer keeps wind and rain out while remaining highly breathable. The Polartec® Alpha™ interior increases insulation.
- Weight: 352 g
- Temperature: -2°C - 10°C / 28°F - 50°F
The best jacket for cold to very cold conditions
The outer layer made from Castelli's exclusive 150g Polartec® AirCore™ electrospun breathable membrane provides industry-leading breathability
Polartec® Alpha™ inner lining for significant insulation with extremely low weight and excellent moisture management
YKK® Vislon® zipper that slides smoothly and opens from the top and bottom, covered for added protection against wind and rain
Zipped key/coin pocket on the front
Three pockets on the back
Reflective piping at the bottom of the pockets
The Alpha 150 Jacket is the jacket designed to keep you riding all winter long. Comfortably. You have no excuses. We set out to design the ultimate winter cycling jacket with a singular goal: to create the best possible jacket, with the best fabrics and innovative construction, to ensure your comfort in the most diverse conditions, even when it's cold and wet. The Alpha 150 is the result of 12 years of continuous refinement of a concept intended to keep you warm and dry, inside and out. New for 2025, the Alpha 150 Jacket now uses Castelli's exclusive Polartec® AirCore™ fabric, for unmatched breathability in a windproof and waterproof fabric. Inside, Polartec's Alpha insulation guarantees warmth while improving moisture management. Thanks to the stretchy, close-fitting fit, it doesn't feel like a winter jacket. This jacket is ideal for cold, dry days but will allow you to face all conditions, unless it's really raining all day, in which case you'll probably opt for rainwear. The fact that it uses recycled yarn and is PFAS-free is an added bonus for the best winter jacket we've ever made.