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Castelli Alpha Wind Jersey - Long-Sleeve - Men's

Sale $137.47 $249.95 45% off

Item # CST002O

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Item # CST002O

Less is more.

After being inspired by its warm, adaptable Alpha jacket, Castelli set out to create an even more minimal layer for winter riding that protected like a jacket and fit like a jersey. Sure, the jacket fits impeccably and protects against winter's harshest conditions without feeling like a mountaineering parka, but the brand knew it could pare the Alpha down even more to further serve its passion for minimalism. On the days when the warmth of a jacket is too much, or for cyclists who just don't like to wear too many layers, the Alpha Wind Jersey will block out gusts of wind and pelting rain without a second thought, with the streamlined, perfectly tailored fit that you'd expect from a Castelli jersey.

Starting with the back panel, Castelli shields the area of your body most exposed to inclement weather on a bike with its proprietary Nano Warm fabric. Breathable and moisture wicking, the fabric will shed water without absorbing it, keeping you dry and warm. Your arms and chest receive protection in the form of Gore's 3-layer knit Windstopper 3 fabric, which blocks out wind and is treated with a DWR coating to repel water. Though it acts like a shell, Windstopper 150's knit construction allows it to provide ample stretch so that it doesn't inhibit your freedom of movement as you ride, and it continues to facilitate moisture transfer while blocking out the elements.

Borrowing from the Alpha jacket's two-layer design, the jersey also features a Prosecco Stratus liner with dual front zippers, ideal for managing your body temperature as you heat up during a long climb. The liner breathes exceptionally well and creates airflow without exposing your base layer or bare skin to icy cold air — when you reach the chilly summit, zip the jacket back up to stay warm and dry on the descent. Castelli paid close attention to constructing the articulated collar to fit comfortably on and off the bike, and it included the same flat, raw-edge waist and wrists as the Alpha jacket that move with you without riding up or bunching, along with a silicone gripper at the waist to keep it in place. And if you notice the front external zipper doesn't look entirely straight, you're not imagining it. Castelli purposely designed an asymmetrical zipper to keep the jacket close to the skin, eliminating the likelihood of the puffy, bunched look that's so common in cold weather kit.

Tech Specs

[front and sleeves] Windstopper 150, [liner] Prosecco Stratus, [back] Nano Warm
full-length YKK Vislon
3 rear, 1 zippered front
Recommended Use:
Manufacturer Warranty:
1 year

Size chart


Men's Apparel
 Small Medium Large X-Large 2X-Large 3X-Large
Chest  35.5 - 37in
(90.2 - 94.0cm)
37 - 38.5in
(94.0 - 97.8cm)
39 - 41in
(99.1 - 104.1cm)
41 - 43in
(104.1 - 109.2cm)
43 - 45in
(109.2 - 114.3cm)
45 - 47in
(114.3 - 119.4cm)
Waist 29.5 - 31.5in
(74.9 - 80.0cm)
31 - 33in
(78.7 - 83.8cm)
33 - 35.5in
(83.8 - 90.2cm)
35.5 - 37.5in
(90.2 - 95.3cm)
38.5 - 40.5in
(97.8 - 102.9cm)
41 - 43in
(104.1 - 109.2cm)
Hips 36.5 - 38.5in
(92.7 - 97.8cm)
38 - 40in
(96.5 - 101.6cm)
40 - 42in
(101.6 - 106.7cm)
42 - 44in
(106.7 - 111.8cm)
44 - 46in
(111.8 - 116.8cm)
46 - 48in
(116.8 - 121.9cm)
How to Measure:
For best results, take measurements over your underwear.
Measure under your arms, around the fullest part of your chest.
Measure around your natural waistline, keeping the tape a bit loose.
Measure around the fullest part of your body at the top of your legs.
Using pants that fit well, measure the crotch seam to the bottom of the leg.

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Unanswered Question

I am 6' 1 200 lbs. 36 inch waist. Usually wear a large. Have not bought Castelli before. Would XL or XXL be best.


  • Fit: Runs small

Castelli's Alpha "jersey" is really a light jacket. A light, aero-fit, thin, soft-fabric, wind-stopper jacket (with a built-in internal vest) for fast riding and climbing in cool/cold weather.

Castelli officially rates it for use from 60° down to 45°. But temp sensitivity is a bit individual.

Pair the Alpha with a light-weight baselayer (Castelli Flanders or Prosecco) for use in cool weather. And with a winter-weight baselayer (Smartwool or Assos) to support use in lower temperatures.

1.) The thermo-regulating built-in interior "vest." Yes! ... This is great for climbing. Unzip when climbing; zip it back up for the chilly descent. Fantastic.
2.) Love the elegant, understated look, and the new collar treatment.
3.) The raw cut sleeves fit perfectly inside Castelli's Lightness or (slightly heavier) Scalda gloves.

Note: The amazing Gore Windstopper textile used in the Alpha is windproof and water-resistant, but not waterproof. This jersey protects great in the fog, mist, or drizzle -conditions so typical of Fall and Winter riding.

However, as I discovered in a recent 2-hour ride under steady showers, the jacket will eventually soak through. So, if the forecast is looking really wet, you WILL want to bring along a lightweight, taped, dedicated rain jacket such as Castelli's "Riparo," "Tempesta," or "Idro" jacket.

Sizing: Size up +1 from your normal street size. Even then it will be a bit snug. Part of Castelli's Rosso Corsa (race) line. Designed for, and tailored for, the fit/athletic rider.

This is indeed an excellent and accurate review, including the advice about sizing. This jacket is the first XL in my closet (M and L in all other cycling clothes) but L would not have worked and XL is a snug, perfect fit.

Nice Jersey for Cool Weather Riding

  • Fit: Runs small
  • Size Bought: Large

I have this jersey in yellow and decided to purchase another on in red. They are definitely pricey (wait for them to go on sale, usually in July), but well made and functional. They do a great job blocking wind. Runs a little bit small (I typically wear a medium, but purchased Large, which fits just right).

Great for cold/cool weather riding

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: 3XL

Much of my riding is in temperatures ranging from 40-60F. This jersey is perfect for that kind of riding. The Gore Windstopper does a great job blocking the wind and the two layer system makes it very easy to regulate my temperature as I ride. I bought one and loved it so much, I bought another in a different color.

Must have for cyclist

  • Familiarity: I've used it several times
  • Fit: True to size

I already own the Gabba LS Jersey but this now is my favorite upper body piece of kit :-) I have to admit that my Gabba LS was size XL. This one is XXL and fits me perfect! Love the internal "vest" and overall snug fit and the understated and non "bling bling" style too.

Really Good

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Small

I bought this to replace my Trasparente Due jersey and it hasn't disappointed.

The Trasparente Due jersey has windstopper on the chest but not the arms. This jersey has full windstopper, chest and arms, and the difference is tremendous - it really adds to the versatility. It enables me to wear this down into the high 40s without getting cold. If I add a Fawesome vest on top I can comfortably get into the mid 40s. I would grab a jacket below 43-44F.

Fit is European Slim fit. The jacket feels weird when not on the bike but 'clicks in' when you start riding.

There are a few things I don't like. The cuffs are supposed to lie flat so the edges look unfinished/raw. I'm concerned how this will wear after a few seasons. Secondly, I wish the pockets were a bit larger.

Overall, this jacket is awesome. I would definitely recommend.

Another great product

  • Familiarity: I've used it several times

I have the medium in black and the fit is similar to other jackets. I find this jacket competes with the Gabba products. They are both water resistant, both can vent etc. etc with the Gabba being slightly more race cut. I wish this jacket had an internal earphone hole. With the proper base layers this coat can over anything from -5 to 15C depending on your personal heat/power etc. A great product, especially at the sale price.

Any size charts for the Castelli Alpha Wind Jersey?

I have the medium and it fits similar to all other "m" Castelli products I have. The arms are a little baggy which appears to be a common them with their coats.

Castelli Alpha Wind Jersey

  • Familiarity: I've used it several times

I've been buying Castelli clothing for over 30 years. I still wear bib shorts, I purched in the early 1990s, love it all. But this new Alph Jersey, best ever!! First ride, about 40 miles, started out in the mid 30's, ended in the low 60s. Never too cold, never too hot (even with the black color!). As with most Castelli gear, the jersey fits tight, but while riding it's perfect! Just zip and unzip the outer layer, as needed - their greatest design ever!

Checking All of the Boxes

  • Familiarity: I've put it through the wringer

You name it, and I've done it in the Alpha Jacket — well, almost everything. Nordic skiing, commuting, cyclocross, mountain biking, road riding — I've been using this piece in the rain, snow, and cold in temperatures from 25 to 65 degrees. The fit is spot on (wearing a Small and I'm 5'10", 140lbs), and it truly feels more akin to a jersey than a jacket. There's absolutely no bulky spot to the piece, and the attention to detail in the ventilation points, seams, and other small accouterments add up to a phenomenal, versatile jacket.

The double layers have made all the difference for climbing, too. Where I am now, riding through the redwoods equates to upwards of 20-degree temperature swings in short stretches of road, so having the multiple options of thermoregulation has really changed the way that I can layer for rides. The Alpha's sleeves also interface extraordinarily well with gloves, and the pocket storage is more than ample.

There are some things that I'd change, however, namely including a waterproof zip pocket for electronics and keys. But given that this isn't a "true" waterproof jacket, only water-resistant, I understand Castelli not electing to include them. Outside of this, though, my complaints are trivial at best and really not worth including in this review.

In terms of warmth, this jacket is more than ample. But if you've read my reviews in the past, you know that I'm a big proponent of light outerwear with strong base layers. For extreme cold on the skis, I've been pairing it with a Castelli Flanders WindStopper base layer all the down to just shy of 25 with wind. Where I'm currently residing, I've been pairing it with a Craft summer-weight base layer for rides varying from 40 to 65 degrees. Moral of the story: if you know how to layer, it's hard to justify spending more on the jacket iteration of the Alpha.

Avg. ride time: 59m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

What temperature range is this made for?

Best Answer

This will keep most people comfortable between 45-59 degrees. It blocks the wind so well, that if you wore a good base layer beneath it you should be fine well below 45 degrees as well.