The Alpha 150 Jacket is the ultimate winter jacket developed by Castelli to provide uncompromising comfort in the coldest and most variable conditions. The result of OLTRE 12 years of evolution of the Alpha concept, it represents the pinnacle in terms of protection, breathability, and textile innovation for winter cycling.
The 2025 innovation is the exclusive use of Polartec® AirCore™ Castelli for the outer layer: a windproof and waterproof fabric with exceptional breathability, capable of protecting against cold, humidity, and light rain without causing sweat buildup. Inside, Polartec® Alpha™ insulation ensures active warmth and optimal moisture management, keeping the body dry both outside and under the jacket. The close fit eliminates the "bulky jacket" effect, offering a surprisingly lightweight feel even on the coldest days.
Ideal for dry winter outings and variable conditions, it effectively resists wind and rain, although it is not designed for intense and prolonged precipitation. The use of recycled yarns and the absence of PFAS complete a highly performant and sustainability-conscious garment.
Technical Specifications:
Structure
Outer layer in windproof and waterproof Polartec® AirCore™ Castelli
Inner insulation in highly breathable Polartec® Alpha™
Innovative construction for active heat management
Features
Effective protection from wind, cold, and humidity
Excellent breathability even under exertion
Recycled yarns and absence of PFAS
Ideal for winter and cold, dry days
Fit
Close, performance-oriented fit, designed to ensure comfort without bulk
Primary Function
To keep the body warm and dry during winter outings, offering the optimal balance between insulation, protection, and breathability
