Castelli Alpha RoS 2 Jacket review

Innovative double layer construction massively helps to improve ventilation.

Castelli Alpha RoS 2 review
(Image credit: Future)
Cycling Weekly Verdict

The Castelli Alpha RoS offers a host of clever features, such as the separation of the insulating and softshell fabrics to deliver exceptional breathability and ventilation – particularly for the level of rain protection the jacket offers. Other great details include the double cuff and collar, which both do a great job at blocking out the draughts. The Alpha RoS isn't the warmest winter jacket – I'd be feeling cold by about +3°C (38°F) – but paired with a good baselayer and it can comfortably go much lower.

Reasons to buy
  • +

    Double layered main body better regulates ventilation

  • +

    Double cuff plays nicely with gloves

  • +

    Waterproof enough for the wet, breathable enough for the dry

  • +

    Form fitting

Reasons to avoid
  • -

    Double zip makes it harder to quickly dump heat

  • -

    Not as warm as some competitors

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We’ve been roundly impressed by much of Castelli’s RoS (Rain or Shine) range, the balance between breathability and waterproofing not only makes riding in the wet a more pleasant experience but also makes the pre-ride decision of the best jacket to wear much easier.

The Alpha RoS 2 Jacket slots into Castelli’s range as its cold weather option, being more heavily insulated than the Perfetto (formally Gabba) and the Alpha RoS 2 Light jackets.

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