Castelli Alpha RoS 2 jacket review

The Castelli Alpha RoS 2 is designed to be used come rain or shine, is it the ultimate in winter cycling jackets?

Castelli Alpha RoS 2 jacket
(Image: © Josh Croxton)

Cyclingnews Verdict

The Castelli Alpha RoS 2 jacket is right at the cutting edge of winter cycling apparel and comfortable at a wide range of temperatures, but there might be a better option depending on the severity of your winter


  • +

    Two-layer construction

  • +

    Warm in all conditions

  • +

    Taped seams

  • +

    Clever collar and cuff


  • -

    Loose neck and shoulders could be better fitted

  • -

    Zippers aren't cam locked

You can trust Cyclingnews Our experts spend countless hours testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

The Castelli Alpha RoS 2 is the brand's deep-winter cycling jacket, designed to offer comfort to those riders who will be heading out no matter what bad news the weather app has in store. It's a widely accepted opinion that Castelli makes some of the best winter cycling jackets available and, the Alpha RoS 2 is no exception. In fact, if I had to choose just one winter cycling jacket to own, the Alpha RoS 2 would be it, and that fact alone makes the premium price tag a little easier to swallow. But that's not the end of the review because, depending on where you live, Castelli's other Alpha RoS 2 Light might just be the better choice. 

According to Castelli, the RoS 2 jacket is designed for use between minus five and 10 degrees Celsius (23 - 50 Fahrenheit). For anyone living in slightly milder conditions, Castelli also makes the Alpha RoS 2 Light, which is functionally similar, but suitable for conditions ranging from seven to 15 Celsius (45 - 59F). 

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Josh Croxton
Associate Editor (Tech)

Josh is Associate Editor of Cyclingnews – leading our content on the best bikes, kit and the latest breaking tech stories from the pro peloton.

Josh has been with us since the summer of 2019 and throughout that time he's covered everything from buyer's guides and deals to the latest tech news and reviews. On the bike, Josh has been riding and racing for over 15 years.

He started out racing cross country in his teens back when 26-inch wheels and triple chainsets were still mainstream, but he found favour in road racing in his early 20s, racing at a local and national level for Somerset-based Team Tor 2000. 

These days he rides indoors for convenience and fitness, and outdoors for fun on road, gravel, 'cross and cross-country bikes, the latter usually with his two dogs in tow.