ALPHA ULTIMATE INSULATED W JACKET
The ultimate winter jacket somehow combines warmth with light weight, the feeling of freedom with full protection, waterproof fabrics with breathability. With the functionality of Castelli's Alpha construction.
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- Weight:334 g
- Temperature:-5°C - 12°C / 23°F - 54°F
Waterproof Polartec® NeoShell® 4-way-stretch outer fabric
Insulating layer in Polartec® Alpha® active insulation for more warmth and breathability
Critical seam taping for effectively waterproof protection in normal riding conditions
Double-layer Alpha construction separates insulating layer from wind/water barrier to let you better regulate ventilation
Asymmetrical double-opening YKK® Vislon® zipper slides easily for better regulation of airflow
No-sew bonded hem lies flat and seals out wind
Anatomically shaped cuff integrates with glove to prevent cold wind or water from entering at wrist
3 rear pockets
Reflective details on rear pockets and shoulders for 360° visibility
Zippered secure side pocket for valuables
If for any reason you are not satisfied with your purchase, you can return the product within 30 days of delivery and request a refund.


For serious winter riding in all conditions, the Alpha Ultimate Insulated Jacket brings premium insulation to this do-everything-well jacket. Castelli's Alpha RoS 2 Jacket set a new standard in winter cycling comfort. The Alpha Ultimate Insulated takes that up a notch with stretchier fabrics and Alpha insulation that provides warmth without bulk. The jacket feels lighter and more comfortable, with similar warmth and breathability. In fact, it's almost 30% lighter, with more stretch to feel even more comfortable. The fabrics make it possible. The fully waterproof and highly breathable Polartec® NeoShell® outer fabric has a high level of four-way stretch. This layer keeps wind and rain out while also letting sweat escape. The insulation is Polartec® Alpha® active insulation, which provides incredible warmth for its weight while also aiding in breathability. Fabrics alone don't make the jacket. The front has one zipper for the insulating layer and a separate zipper for the outer shell, so you can open the outside for ventilation while keeping the insulating layer closed. This allows for better overall ventilation during a climb or effort, yet you'll be drier when you close everything back up for the downhill. All the other features are carefully considered to make this your ultimate winter jacket.