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  • Castelli - Alpha Ros Jacket - Men's - Red/Black
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  • Castelli - Alpha Ros Jacket - Men's - Red/Black
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Castelli Alpha Ros Jacket - Men's

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    12 Reviews


    The alpha dog in winter.

    Cold-weather cycling creates a conundrum. Naturally, we want to stay as warm as we can but if the jacket doesn't breathe well and we get too hot, we'll begin to sweat. This isn't a good thing especially if we start descending and the wind chill cools our damp jacket. To truly stay comfortable, it is imperative to have something that keeps the elements out yet regulates body temps. Leave it to the wizards at Castelli to produce a piece of kit that defies our expectation of what we know of a winter jacket. The Alpha ROS Jacket is ready for Rain Or Shine and is there to help make all of your winter rides more enjoyable. What's really nice about this jacket is that it works so well, it inspires us to go ride even in the worse conditions.

    The Alpha ROS Jacket's two-layer construction separates the thermal insulation layer from the wind- and waterproof outer shell. A double front opening to diffuse the cold air when you open up to ventilate on the climbs and prevent overheating. The thermal layer is breathable and is able dissipate heat easily so temperature regulation is an all over affair and not just confined to small pockets. If things heat up even more, the thermal layer can also be zipped down. By crating two layers, each can do their job more efficiently. The thermal piece adds warmth and is more breathable while the outer Windstopper fabric keeps you dry and keeps the chill out. This results in you being less clammy at the top of the climb, and with a quick zip up, you can descend shiver-free since you'll be warm and dry.

    By using Gore’s new Windstopper light rain-resistant membrane and DWR treatment, selective seam sealing, careful seam placement and construction, and a waterproof YKK Vislon zipper the jacket is essentially waterproof without compromising characteristics making it such a great dry-weather jacket too. No matter the weather report or what kind of ride or training you have on tap, this jacket pretty much guarantees a dry and warm experience.

    The Alpha ROS features raw edges at the waist and wrist—a trend defining top-end gear in the cycling industry of late. Raw edges mean that the hem and cuffs don't contain elastic inserts, so they allow for complete freedom of movement and fit nicely under gloves' cuffs. The jacket never rides up, so no tugging it back into position if you have spent time doing an interval in the drops and now you are recovering on the tops.

    The fit of the Alpha ROS Jacket is actually more akin to that of a jersey. Since it does come with its own thermal layer, base layers of varying degrees, depending on the temps, can be employed customizing the jacket to the conditions. Castelli rates the optimum operating temperature range between 23- to 50-degrees Fahrenheit. The Italian brand is typically conservative with its temperature estimates, so that huge range speaks volumes for the jacket's versatility.

    The Alpha ROS Jacket's aggressive cut rides very close to your body. Stretch fabrics with advanced patterning make for an excellent snug fit that still accommodates a wide range of body types. You will notice a tighter feel across the chest when off the bike; however, once you're clipped in and rolling, the Alpha ROS is designed to accommodate your arms, shoulders, and back as you reach for the handlebars, so there's little or no bulge or baggy material. The articulated collar is cut to prevent wind from catching it, and the shell and thermal layers' zippers are offset to eliminate bulk and allow easy access on the go. It has three rear pockets and a zippered pocket in the rear and the front.

    • A next-generation cycling jacket for cold and wet weather
    • Windstopper 150 membrane blocks wind and water without stifling
    • Insulating thermal midlayer zips separately for targeted warmth
    • Race fit eliminates flapping material during tempo base miles
    • Maintains breathability to manage moisture during hard efforts
    • Raw-cut hem and cuffs add comfort and improve fit
    • Castelli's revolutionary all-weather race kit continues to evolve
    • Item #CST00IC

    Tech Specs

    [membrane/laminate] Windstopper 150, [face fabric] 100% polyester, [liner] 90% polyester, 10% elastane
    Waterproof Rating
    double front opening
    3 rear, 1 zip side
    rear pockets
    Claimed Weight
    Recommended Use
    road cycling
    Manufacturer Warranty
    1 year

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

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    Great Jacket - Typical Castelli Sizing

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: Runs small
    • Size Bought: large
    • Height: 6'4"
    • Weight: 175lbs

    Used the jersey twice in 30 degree weather; very comfortable and really keeps the cold out. I'm 6'4" and normally go with a large jersey, but Castelli is known for their sizes running small and this jacket is no exception. Got an XL and its snug, but I really like it.


    • Familiarity: I returned this product before using it
    • Fit: Runs small
    • Size Bought: X Large
    • Height: 5'9"
    • Weight: 175lbs

    Bought the jacket as a Christmas gift to my father but it was too small. Material is great and the jacket is truly superior to others.

    One stop shop solution!

    • Familiarity: I've used it several times
    • Fit: Runs small
    • Size Bought: XL
    • Height: 6'
    • Weight: 170lbs

    This is my winter cycling solution...rain, shine, wind and I picked orange to be totally visible on the road! Best investment I have ever made. Highly recommended. The true test was a couple 2-3 hour rides in 35-39 degree cold rain. It kept me warm in that worst possible chill condition with a merino wool base layer.

    Size Size Size

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: Runs small
    • Size Bought: XL
    • Height: 5'8"
    • Weight: 155lbs

    I read a lot of reviews of this jacket and decided to take the plunge (full disclosure I bought the limited edition grey version but figured this version will be around awhile, so I am putting my review here). I normally wear a size Med in just about all clothing. I am average slim athletic build, meaning I have shoulders and a chest from years of doing sports beyond cycling. I am not Euro pro thin, hipster thin, nor cross-fit bulky. I decided to buy a Med and Lg to test and tried on the Lg first when it arrived. I felt just shy of being a sausage. Even with a short sleeve base layer it felt snug. Stuffing a jersey in as well was doable but I questioned if I'd really be comfortable on a long ride. I decided to order an XL and its night and day. It is not baggy, but just a bit of extra material makes all the difference. The sleeves are still the right length, but the tail is a little long in back. In a riding position, that just gives you more coverage.

    The quality of materials and construction are superb. Really looks good. Bottom line though: if you want aero-sleek with not much extra room, size up one size. If you want flexibility with your performance, go up two sizes.

    Best cycling jacket I ever had!

    • Familiarity: I've put it through the wringer
    • Fit: True to size
    • Size Bought: Small
    • Height: 5'7"
    • Weight: 128lbs

    Can't go wront with this jacket, it feels like I never overheat but also never get cold. I use it everyday during the fall season to commute at down to -10C and never have any problems! The fit is really nice on the bike, but don't try to use it for something else like hiking, the cut is really made for cycling and it will feel very tight and uncomfortable otherwise.

    Worth Every Dollar

    • Familiarity: I've used it several times
    • Fit: Runs small
    • Size Bought: 3XL
    • Height: 6'2"
    • Weight: 205lbs

    The Castelli Alpha Ros Jacket does a fantastic job of keeping me warm and dry when it's below 40F. For me, a race tight fit is not essential, so I ordered the 3XL and am pleased with the fit.

    Awesome jacket

    • Familiarity: I've used it several times
    • Fit: Runs small
    • Size Bought: Large
    • Height: 6'0"
    • Weight: 190lbs

    Used it vatious times, but the one time worth mentioning is, i used during a race this winter, Temp was about 30 degrees, night time, after the second lap it started pouring and I mean pouring rain, (like you couldn't draft the person ahead of you due to the roost cooming off their tire, pouring) for the next 6 laps the sky just let it all out, I was dry, everyone that dressed in just a race kit was freezing, those that bundled were overheating and wet, some didn't finish. This jacket kept me super dry and warm. Just in not feeling like an ice cube that night, it was totally worth every penny.

    Warm, Simple And Sleek

    • Familiarity: I've put it through the wringer

    I've been extremely pleased with the Alpha Ros Jacket. Winter training is sub 32 F degree weather is made simple knowing you'll keep warm and dry. I picked up the bright orange variant knowing it would contrast well in snowy conditions.

    Sizing and fit remain consistent with Castelli's Euro fit and is not bulky at all. This a very versatile piece, the key is to vary your base layers based on the temperature you're riding in. I'll use a sleeveless summer base layer for warmer days or a heavy wool baselayer for the coldest of days.

    Overall, this is my go to jacket during the cold winter months, and I think Castelli has done an excellent job on this piece.

    Quality Piece

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: True to size
    • Size Bought: XXL
    • Height: 6'6"
    • Weight: 205lbs

    I bought this as I wanted something that fit tighter than most traditional winter jackets. I almost always struggle with sizing, but, this is a nice, tight fit and allows for a base layer or two, without being baggy. I've only used once in 25-27 degree weather with a Castelli Flanders base layer and found that I was warm throughout my ride. The jackets seems to breath pretty well, but, my base layer was certainly wet by the end of my ride. The bright orange is a nice contrast to most of my gear and hopefully makes me more visible while riding.


    • Familiarity: I've used it once or twice and have initial impressions

    Pros: Dual layers for easier temp moderation.
    Cons: Many sewn parts that are prone to fail. Not as warm as expected. Inner layer not removable.
    Fit: Form fitting closer to race fit than casual fit.
    Summary: I purchased this specifically for riding in colder temps (< 32 degrees). Tried it out this morning and it was exactly 32 degrees. First 10 minutes I was cold. After some moderate pedaling, I warmed up to a comfortable temp. My base layer was an Under Armour ColdGear Evo Long Sleeve Compression Mock. Any temps lower than 32 degrees and I'd consider another layer.
    By comparison, I also have the Senza 2 jacket. The Senza 2 is definitely more bulky and more of a casual fit, but it feels warmer. The Alpha ROS does have the benefit of unzipping the outer layer for more temp moderation.
    Overall, I wish the Alpha ROS was warmer, was more of a casual fit, and didn't have so many sewn pieces that will eventually fail. Would I purchase it again? Probably not. My biggest concern is the durability of all the sewn pieces.