The Castelli Men's Alpha 150 Jacket is made so you can ride all winter long. Comfortably. No excuses. They set out to make the ultimate winter riding jacket featuring the best fabrics and innovative construction, and ensuring comfort in the widest range of conditions, including cold and wet.
The Alpha 150 is the result of 12 years of continual refinement of a concept to keep you warm and dry, both inside and out. New for 2025, the Alpha 150 Jacket now uses Castell's exclusive Polartec® AirCore™ fabric for unmatched breathability in a windproof and rainproof fabric. On the inside, Polartec's Alpha insulation provides warmth while enhancing moisture management. The stretchy close-to-body fit means you don't feel like you have a full winter jacket on.
This jacket is ideal for cold, dry days yet can stand up to everything except all-day driving rain, when you'll probably reach for a rain shell. The fact that it uses recycled yarns and is PFAS-free is a bonus feature of the best winter jacket to bear the name of Castelli.
B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.
| S | M | L | XL | 2XL | 3XL | |
| Chest | 36¼" | 37¾" | 39½" | 41¼" | 43¼" | 45¼" |
| Waist | 31½" | 33" | 34½" | 36½" | 38½" | 40½" |
| Hips | 37" | 38½" | 40" | 42" | 44" | 46" |
| Inseam | 32¼" | 32.67" | 33" | 33½" | 33.85" | 34¼" |
Sleeve Type: Long Sleeve | |
Brilliant Orange/Dark Grey - Medium | Mfg PartNum: B4525502034-3 |
Brilliant Orange/Dark Grey - Large | Mfg PartNum: B4525502034-4 |
Brilliant Orange/Dark Grey - X-Large | Mfg PartNum: B4525502034-5 |
Brilliant Orange/Dark Grey - 2X-Large | Mfg PartNum: B4525502034-6 |
Light Black/Black - Small | Mfg PartNum: B4525502085-2 |
Light Black/Black - Medium | Mfg PartNum: B4525502085-3 |
Light Black/Black - Large | Mfg PartNum: B4525502085-4 |
Light Black/Black - X-Large | Mfg PartNum: B4525502085-5 |
Light Black/Black - 2X-Large | Mfg PartNum: B4525502085-6 |
Mango Mojito/Black - Small | Mfg PartNum: B4525502712-2 |
Mango Mojito/Black - Medium | Mfg PartNum: B4525502712-3 |
Mango Mojito/Black - Large | Mfg PartNum: B4525502712-4 |
Mango Mojito/Black - X-Large | Mfg PartNum: B4525502712-5 |
Mango Mojito/Black - 2X-Large | Mfg PartNum: B4525502712-6 |
This is my favorite winter jacket and I have a lot of 'em. Here in the Eastern Sierra it is high, dry and cold, by which I mean in the low thirties (fahrenheit!). This jacket was made for such conditions, the Alpha direct insulation and advanced breathable shell make for a comfortably dry and therefore warm ride. It's not actually a substitute for its predecessor, the Alpha Doppio, which I also have, because this jacket is stretchy and fits tight, which limits layering. The Doppio is (much) more weather proof and has room for more layers, so I save it for the stormy days. Finally, the caveat is, this jacket is not perfectly windproof despite what the ad copy says. It takes a very cold day with a headwind, but I have to break out the shell. I have that with me anyway, because as Castelli admits, this is a fair weather jacket...

