Castelli Alpha 150 Winter Cycling Jacket 2026

The Castelli Alpha 150 Jacket is the ultimate winter jacket for cyclists who face the cold without compromise. Designed to maintain an ideal balance between warmth, protection and breathability, it combines two cutting-edge technologies developed by Polartec®.

On the outside, the 150g Polartec® AirCore™ spunbond membrane, exclusive to Castelli, offers outstanding windproof protection and effective resistance to light rain, whilst ensuring some of the best breathability on the market. This innovation allows you to ride comfortably even in the most demanding conditions.

On the inside, the Polartec® Alpha™ insulating lining provides exceptional warmth for minimal weight. Its moisture-wicking properties keep you dry even during the most intense efforts, thus avoiding the often unpleasant damp feeling found in technical clothing.

The jacket also features a two-way YKK® Vislon® zip, protected against wind and rain, which makes it easy to regulate your temperature whilst on the move. In terms of practicality, it features three spacious rear pockets and a zipped pocket ideal for storing keys or loose change. Finally, reflective elements enhance visibility and safety on the road, making this a jacket that is as high-performance as it is reassuring.

Technical specifications:

- Colours: Deep Bordeaux/Clay, Light Black/Black, Brilliant Orange/Dark Grey, Mango Mojito/Black
- Sizes: XS to XXXL
- Temperature range: -2°C – 10°C
- Weight: Ultra-light (effective insulation without bulk)
- Fit: Tailored
- Insulation: Polartec® Alpha™ – optimal warmth and breathability
- Water resistance: Light rain protection (DWR)
- Wind resistance: Full (front and back)
- Breathability: Exceptional thanks to Polartec® AirCore™
- Zip: YKK® Vislon® two-way, covered
- Pockets: 3 rear pockets + 1 zipped pocket
- Reflective elements: Piping at the bottom of the pockets for increased visibility
- Brand: Castelli

Castelli size guide