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Castelli Alpha RoS 2 Light Women’s Jacket



Superb jacket for most conditions and three full seasons
Excellent water repellence
Stylish, comfortable cut
No lower zip guard
381g Recommends

This product has been selected to feature in recommends. That means it's not just scored well, but we think it stands out as special. Go to recommends

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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The Castelli Alpha RoS 2 Light Women's Jacket is a high quality, high performance and comfortable three-season option that puts a significant dent in your wallet. It does do away with gilets or numerous baselayers though – it protects brilliantly in a wide range of temperatures and weathers.

There are so many winter jackets available these days the choice is overwhelming. Castelli alone has no fewer than seven long-sleeved jackets on its site, but I'd say the Alpha RoS 2 Light is the best 'all-rounder' option there. It works hard from early autumn through to spring, and needs very few additional bits of kit to support it.

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The Alpha RoS 2 Light has a double layer build. Inside is the lightweight, insulating fabric known as ProSecco Strada. Outside, the front panels and sleeve fronts are made of Gore-Tex Infinium Windstopper 150, while the back and underarms are Nano Flex Xtra Dry for protection against rain.

2021 Castelli Alpha RoS 2 Light Women's Jacket - back.jpg

Each layer has its own YKK zip – it looks a bit like you've got half a waistcoat sewn into the jacket. It's a strange idea to get used to; the rote action of jacket-on-jacket-off goes out the window.


Of the three Castelli jackets/jerseys I've been testing recently, this is by far the best fit for me. The cut is well thought out and, despite this being a winter jacket, it doesn't have that sense bulk or thickness you so often find.

2021 Castelli Alpha RoS 2 Light Women's Jacket - stitched in panel.jpg

In my size it gives a relaxed fit with a little room round the torso and down the full length of the sleeves (it's not me in the photos), which seems to promote ventilation and moisture transfer. While being generous, the cut is flatteringly feminine and the jacket doesn't budge or flap in any riding position. Consider sizing down if you like a very snug fit, though.

2021 Castelli Alpha RoS 2 Light Women's Jacket - cuff.jpg

Sleeve and body length are both good. The cuffs are simple elastic affairs, and sit over a slim glove perfectly – bulkier winter gloves are happier over the top.

2021 Castelli Alpha RoS 2 Light Women's Jacket - gripper.jpg

The wide, raw-edge elasticated waist is brilliantly designed, coming into its own when you're on the bike. It sits low at the front and has generous length at the rear. It simply doesn't budge; the elastic, coupled with a silicone strip, effectively forms a seal between the jacket and your tights/shorts. Despite the relaxed fit, I never once found it needed adjusting.

2021 Castelli Alpha RoS 2 Light Women's Jacket - shoulder detail.jpg

The neck line is high – perfect for really cold days – and warm enough you'll want it unzipped on mild days. There's a tongue of soft fleecy fabric that sits against the back of the neck, too. As a whole, the fit is engineered to keep the cold out and the heat in, and it does that very well.


Castelli recommends this for between 8-15°C. While I haven't had the opportunity to take it up to 15 degrees, I've had plenty of rides from around 12° to below the lower limit.

2021 Castelli Alpha RoS 2 Light Women's Jacket - Gore-Tex logo.jpg

While I'm not a fan of no baselayer (in any weather), the Alpha RoS 2 Light easily functions without one on mild days; the torso is soft and comfortable against bare skin, although the sleeves are not so luxurious. Once the mercury hits single figures, a long-sleeved base layer was all I needed beneath. I found with this set-up I was comfortable down to near-zero. The jacket keeps off bitter wind chills brilliantly.

Castelli doesn't guarantee 100% waterproofing, but in light rain and showers the water beads off, the shoulder seams are sealed and the zip is waterproof. The Nano Flex Xtra Dry fabric on the back holds off showers too, but after 30 minutes of heavy rain it begins to feel damp (yet not cold).

2021 Castelli Alpha RoS 2 Light Women's Jacket - shoulders.jpg

I never sensed a build-up of moisture and have to admit to being surprised that, when took the jacket off after some pacier rides, there was significant moisture clinging to the jacket's interior... Still, the fabrics perform sufficiently well to keep me warm despite the build-up.


The three rear pockets are perfectly positioned for access on the move and generous in size, while a base insert means you can stuff them full and the pocket stretches – not the jacket. There's a fourth zipped pocket at the side for keys or money. For me, this is so much more accessible and functional than one sitting on top of another pocket.

2021 Castelli Alpha RoS 2 Light Women's Jacket - pockets.jpg

I absolutely love this Fiery Red – top marks for visibility – but if you prefer more subtle colours it also comes in Rescue Blue, Savile Blue and – fantastically – Light Black.

2021 Castelli Alpha RoS 2 Light Women's Jacket - side pocket.jpg

The only thing missing from the Alpha RoS is a lower zip guard. Castelli's own tights have paid the price for this omission by bobbling up, though less delicate fabrics haven't been affected.

> 29 of the best winter cycling jackets - stay warm and dry when it's cold and wet

Quality and performance come at a cost, and the Alpha RoS 2 Light is no exception. It's still not the most expensive, though – Rapha's women's Classic Winter Gore-Tex Jacket will set you back a further £45, while Assos' UMA GT Ultraz Winter Jacket EVO is £290.

More thrifty alternatives include dhb's Aeron Rain Defence Polartec Jacket for £130 or Lusso's Aqua Repel Jacket at £134.99; Stu tested the men's version earlier this year.


The Alpha RoS 2 Light is packed full of technology to keep you comfortable, warm and dry throughout a good chunk of the year. Yes, the price is high, but its versatility, quality and style are unquestionable.


Superb jacket for most conditions and three full seasons test report

Make and model: Castelli Alpha RoS 2 Light Women's Jacket

Size tested: Medium

Tell us what the jacket is for and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

Castelli says: "Castelli's best jacket for mild conditions, with front wind protection, light insulation, maximum breathability, and water repellency to keep you dry in mist, light rain or spray from wet roads."

Tell us some more about the technical aspects of the jacket?

*GORE-TEX INFINIUM™ WINDSTOPPER® 150 fabric on front and sleeves for wind protection with high breathability and effective rain protection

*Nano Flex Xtra Dry on back for more ventilation allows heat and sweat to escape while shedding rain thanks to a nanotechnology water-repellent finish

*Alpha double-layer construction separates windproof layer from insulation layer, allowing better ventilation management

*Inner layer in ProSecco Strada for lightweight insulation with effective moisture management

*Double YKK® Vislon® front zippers

*Front zippered pocket

*3 rear pockets with reflective laser-cut drain holes

*Raw-edge waist lies flat and moves with you

*8°-15 °C / 46°-59°F

Weight:386 g

Rate the jacket for quality of construction:
Rate the jacket for performance:
Rate the jacket for durability:

No signs of weakness in the construction or fabrics.

Rate the jacket for waterproofing based on the manufacturer's rating:

Keeps off showers and light, persistent rain.

Rate the jacket for breathability based on the manufacturer's rating:
Rate the jacket for fit:
Rate the jacket for sizing:

I'd say size down if you're on the cusp.

Rate the jacket for weight:
Rate the jacket for comfort:
Rate the jacket for value:

How easy is the jacket to care for? How did it respond to being washed?

Fine in the advised 30 degree cycle.

Tell us how the jacket performed overall when used for its designed purpose

Brilliant in a range of temperatures that actually exceeds those suggested. Add the support of a single base layer (in colder weather) and you're fully protected from bitter winds and light rain from around 4 to 14°C.

Tell us what you particularly liked about the jacket

Fit, versatility.

Tell us what you particularly disliked about the jacket

Lack of lower zip guard.

How does the price compare to that of similar products in the market including ones recently tested on

This is in the mid to upper range. It's still not the most expensive, though – Rapha's Women's Classic Winter Gore-Tex Jacket will set you back a further £45, while Assos' UMA-GT-Ultraz is £290. More thrifty alternatives include dhb's Aeron Rain Defence Polartec Jacket for £130 or Lusso's Aqua Repel Jacket at £134.99.

Did you enjoy using the jacket? Yes

Would you consider buying the jacket? Yes

Would you recommend the jacket to a friend? Yes

Use this box to explain your overall score

It's versatile, stylish, functional and very effective – it's only really lacking a lower zip guard!

Overall rating: 9/10

About the tester

Age: 39  Height: 173cm  Weight: 64kg

I usually ride: Road  My best bike is: Carbon road.

I've been riding for: Over 20 years  I ride: Most days  I would class myself as: Expert

I regularly do the following types of riding: commuting, touring, club rides, general fitness riding, Getting to grips with off roading too!

Emma’s first encounters with a road bike were in between swimming and running. Soon after competing for GB in the World Age Group Triathlon Championships in Edmonton in 2001 she saw the light and decided to focus on cycling. 

After a couple of half decent UK road seasons racing for Leisure Lakes, she went out to Belgium to sample the racing there and spent two years with Lotto-Belisol Ladies team, racing alongside the likes of Sara Carrigan, Grace Verbeke, Rochelle Gilmore and Lizzie Deignan. Emma moved from Lotto-Belisol to Dutch team Redsun, then a new Belgian team of primarily developing riders, where there was less pressure, an opportunity to share her experience and help build a whole new team; a nice way to spend her final years of professional racing. 

Since retiring Emma has returned to teaching. When not coercing kids to do maths, she is invariably out on two wheels. In addition to the daily commute, Emma still enjoys getting out on her road bike and having her legs ripped off on the local club rides and chain gangs. She has also developed an addiction to touring, with destinations including Iceland, Georgia and Albania, to mention just a few. There have also been rare sightings of Emma off-road on a mountain bike…

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CyclingSilvers | 3 years ago
1 like

Poor quality definitely wasn't noticeable on the jacket I tested... I'd agree that, if this was the case, it's not worth the money- as I pointed out on Castelli's Velocissima Tights that I reviewed. Too late now for you both but many of these big manufacturers will offer a warranty against poor workmanship...

'If you feel that your gear is eligible for a warranty evaluation for a manufacturing defect in its materials or workmanship, contact our Warranty Department.

To help expedite your warranty request, please provide as much detail as possible in your email. Include the order number, purchase date, item style and description, and a picture of the defect.'

Chris Hayes replied to CyclingSilvers | 3 years ago

Good point on the warranties, Emma.  Perhaps I should have returned it. Together with the Gabba which has stitching that has perished around the collar.  Like bikercub says below, this is a shame as it spoils otherwise very good equipment. 

I don't have much cycling gear - though my wife would disagree - and have always just bought Assos and Rapha on the basis that the former doesn't break and the latter can be sent back to their excellent repair service. I also know that I can recycle them on eBay too.  I bought the Castelli pieces as they had good reputations and apart from the stitching they are great - but stitching does hold them together.  Their summer net cap is genius, however.  

Chris Hayes | 3 years ago

I have the mens version of this and whilst the concept is pretty good, the manufacturing quality - particularly the stitching - isn't good enough to justify this price.  

First time I took it off, I tugged at the sleeve to take it off and felt the stitching come away.  Of course, you can be careful - but I have a couple of Assos Airblock 851s which do a similar job that are 15 years old with better stitching.

bikercub replied to Chris Hayes | 3 years ago

I agree. The stitching came away on the rear pockets of mine. I returned it. The same happened to the replacement. I decided to live with it as its such a great piece of kit. Very disappointing niggling let down of an otherwise brilliant piece of kit. 

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