The best winter jacket. The outer layer in Polartec® AirCore™ protects against rain and wind, ensuring maximum breathability. The inner layer in Polartec® Alpha™ provides additional insulation.

Technical features:

• Weight: 352 g
• Temperature:-2°C - 10°C / 28°F - 50°F
• Fit: Tailored

The best jacket for cold to harsh temperatures

Outer layer made with the exclusive Polartec® AirCore™ Castelli membrane weighing 150 g, windproof and created through electrospinning, for industry-leading breathability

Ultra-light inner layer in Polartec® Alpha™ for excellent insulation and breathability

Easy-glide YKK® Vislon® bi-directional zip opening, with rain and wind protection

Key/money pockets with front zip

3 rear pockets

Reflective trims at the bottom of the pockets

Alpha 150 Jacket is the ideal jacket for the entire winter. Comfort. Without compromise. We decided to create the perfect cycling jacket for winter, with the sole goal of making the best possible jacket using the best fabrics and an innovative structure that guarantees comfort in the most varied conditions, including cold and humidity. 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, Alpha 150 Jacket is made with the exclusive Polartec® AirCore™ Castelli: a windproof and waterproof fabric with unbeatable breathability. The internal insulation in Polartec® of 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 dry cold days and can withstand everything except heavy rain all day long, in which case you will probably need to use 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.