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ALPHA ULTIMATE INSULATED 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.

1 2 3 4 5  4.6  (5 reviews)

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4522507

Product features

  • Waterproof Polartec® NeoShell® 4-way stretch outer fabric
  • Insulating layer in Polartec® Alpha® active insulation for more warmth and breathability
  • Critical external 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
  • 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
  • Reflex zones at lower back, on shoulders, and around wrists
  • Zippered secure side pocket for valuables
  • Waterproof Polartec® NeoShell® 4-way stretch outer fabric
  • Insulating layer in Polartec® Alpha® active insulation for more warmth and breathability
  • Critical external 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
  • 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
  • Reflex zones at lower back, on shoulders, and around wrists
  • Zippered secure side pocket for valuables

Technical Features

Insulation

Waterproofness

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Waterproofness tooltip 

Windproofness

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Windproofness tooltip 

Breathability

Lightness

  • Weight:389 g
  • Temperature:-5°C - 12°C / 23°F - 54°F
  • Fit:Tailored
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    Fit tooltip

What It Is

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.
Polartec® Alpha® Direct

Polartec® NeoShell®

Lightweight fabric designed for clothing worn during physical activity of long duration and intense effort in extreme conditions. Extremely breathable, waterproof and windproof. Offers maximum freedom of movement and protection.

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 is 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.
Reviews

Here is what our customers think about it

4.6

1

2

3

4

5

5 reviews

Presa a saldo. Ottima per qualità e finiture. Non mi resta che provarla.

18/04/2024

Fidato delle sensazioni, presa a saldo per prossimo inverno.
Spero che i consigli e soprattutto il "marchio" non tradiscono le aspettative

Marcello Bonifazi

1

2

3

4

5

5

100 points from 100

11/02/2024

I am a bike messenger from Berlin. I worn this jacket during the winter, from ,-3 to + 5 degrees, during hours of wet snow or constant rain. I worn it with only one baselayer not even a thik one. This jacket always kept me warm, never made me sweat, always stayed dry from i side. Its a masterpeace. I wear it on my Insta- profil alarma_rad. Also my second jacket Perfetto RoS wich is same greatness with higher temperatures like 5-10 degrees.

Andreas Ulke

1

2

3

4

5

5

Exceptionnelle

31/01/2024

Cette veste d'hiver est incroyable.
Même par températures hivernales notables (2-5°), une sous-couche suffit amplement pour rester au chaud. En cas de surchauffe, on ouvre un peu la veste et la fraicheur revient instantanément.
La veste tient au corps et est très confortable. En outre, elle dispose d'un système de fermeture à un double-zip très pratique. Les manches sont longues et il y a un petit bec à l'arrière pour éviter de finir les fesses trempées en cas d'intempéries. Pour ne rien gâcher, elle est également très légère.
Les poches arrières (3) sont bien fermes de sorte qu'on ne craint pas de perdre ce qu'on y met et il y a également une poche zippée latérale pour mettre les choses de valeurs (argent, carte, clés).
Maintenant que je l'ai, je ne peux plus m'en passer pour mes sorties hivernales.

Adrien A.

1

2

3

4

5

5

Giacca leggera e calda!

18/12/2023

Provata con temperatura da 1°C ai 6°C mi ha protetto in modo perfetto senza mai avere sensazione di freddo. Sicuramente andrà bene anche con temperature inferiori.
Leggera, comoda, calda e traspirabile.
Presa in saldo vale tutti i soldi spesi! Consigliata!

Matteo Arman

1

2

3

4

5

5

Giacca tecnicamente perfetta

02/12/2022

La giacca tecnicamente è perfetta, ma i colori non sono idonei per girare le strade. Ci vogliono anche colori accesi, per la nostra sicurezza. Abbiamo bisogno di pedalare in qualsiasi condizione atmosferica e per questo vi ringrazio, senza Castelli non esco mai con la mia bici, ma dobbiamo pensare anche alla sicurezza!! Il total black l’ho abbandonato da anni. Almeno la giacca o la maglia deve essere colorata
Buone pedalate!!!

Riccardo Dell’Aiuto

1

2

3

4

5

3

Presa a saldo. Ottima per qualità e finiture. Non mi resta che provarla.

18/04/2024

Fidato delle sensazioni, presa a saldo per prossimo inverno.
Spero che i consigli e soprattutto il "marchio" non tradiscono le aspettative

Marcello Bonifazi

1

2

3

4

5

5

100 points from 100

11/02/2024

I am a bike messenger from Berlin. I worn this jacket during the winter, from ,-3 to + 5 degrees, during hours of wet snow or constant rain. I worn it with only one baselayer not even a thik one. This jacket always kept me warm, never made me sweat, always stayed dry from i side. Its a masterpeace. I wear it on my Insta- profil alarma_rad. Also my second jacket Perfetto RoS wich is same greatness with higher temperatures like 5-10 degrees.

Andreas Ulke

1

2

3

4

5

5

Exceptionnelle

31/01/2024

Cette veste d'hiver est incroyable.
Même par températures hivernales notables (2-5°), une sous-couche suffit amplement pour rester au chaud. En cas de surchauffe, on ouvre un peu la veste et la fraicheur revient instantanément.
La veste tient au corps et est très confortable. En outre, elle dispose d'un système de fermeture à un double-zip très pratique. Les manches sont longues et il y a un petit bec à l'arrière pour éviter de finir les fesses trempées en cas d'intempéries. Pour ne rien gâcher, elle est également très légère.
Les poches arrières (3) sont bien fermes de sorte qu'on ne craint pas de perdre ce qu'on y met et il y a également une poche zippée latérale pour mettre les choses de valeurs (argent, carte, clés).
Maintenant que je l'ai, je ne peux plus m'en passer pour mes sorties hivernales.

Adrien A.

1

2

3

4

5

5

Giacca leggera e calda!

18/12/2023

Provata con temperatura da 1°C ai 6°C mi ha protetto in modo perfetto senza mai avere sensazione di freddo. Sicuramente andrà bene anche con temperature inferiori.
Leggera, comoda, calda e traspirabile.
Presa in saldo vale tutti i soldi spesi! Consigliata!

Matteo Arman

1

2

3

4

5

5

Giacca tecnicamente perfetta

02/12/2022

La giacca tecnicamente è perfetta, ma i colori non sono idonei per girare le strade. Ci vogliono anche colori accesi, per la nostra sicurezza. Abbiamo bisogno di pedalare in qualsiasi condizione atmosferica e per questo vi ringrazio, senza Castelli non esco mai con la mia bici, ma dobbiamo pensare anche alla sicurezza!! Il total black l’ho abbandonato da anni. Almeno la giacca o la maglia deve essere colorata
Buone pedalate!!!

Riccardo Dell’Aiuto

1

2

3

4

5

3
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