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Castelli Alpha Ros Jacket - Men's


Item # CST00IC

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Item # CST00IC

Alpha Dog.

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 and waterproof fabric keeps you dry and 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 in shiver-free wonderment 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 which we have noticed on other top-end gear in the cycling industry lately. Raw edges mean that the hem and cuffs don't contain elastic inserts, so they allow for complete freedom of movement. 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. Cuffs fit nicely inside gloves keeping drafts at bay and relieving any unnecessary bunching or restrictions.

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 aggressive cut of the Alpha ROS Jacket is 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 are on the bike, the Alpha ROS is designed to accommodate your arms, shoulders, and back as you reach for the handlebars so there's no bulge or baggy material in the position. 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 cycling jacket for cold and rainy weather
  • Windstopper 150 membrane blocks wind and water
  • Incorporates insulating thermal midlayer
  • Race fit eliminates flapping material
  • Maintains breathability during hard efforts
  • Raw-cut hem and cuffs and comfort and improve fit
  • Castelli's revolutionary all-weather race kit continues to evolve

Tech Specs

[membrane] 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

Size chart


Men's Apparel
Chest 36.2in
Waist 31.5in
Hip 37in
Inseam 31.9in
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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