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  • Castelli - Alpha Ros Long-Sleeve Jersey - Women's - Light Black/Black
  • Castelli - Alpha Ros Long-Sleeve Jersey - Women's - Electric Magenta/Black
  • Castelli - Alpha Ros Long-Sleeve Jersey - Women's - Dark Gray/Black

Current Color

  • Castelli - Alpha Ros Long-Sleeve Jersey - Women's - Light Black/Black
  • Castelli - Alpha Ros Long-Sleeve Jersey - Women's - Electric Magenta/Black
  • Castelli - Alpha Ros Long-Sleeve Jersey - Women's - Dark Gray/Black

Castelli Alpha Ros Long-Sleeve Jersey - Women's

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    • Light Black/Black
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    4 Reviews


    Zero Compromises.

    The Castelli Women's Alpha ROS jacket is its most technical one to date and fills in right between a light jacket and a warm jacket. The ROS (Rain or Shine) excels in both cold and dry or wet and cool conditions with Windstopper fabric material on the front and sleeves and a Nano Flex Xtra Dry back for extra breathability.

    This jacket's strongest suits are keeping you warm yet dry and the regulating temps during chilly departures and high-intensity efforts. The Alpha double-layer construction front helps you manage ventilation and lets this piece go from mild conditions down to cooler temperatures. While it's not guaranteed to keep you as dry as an all-out rain jacket, the Alpha ROS does keep you warm and dry in the widest range of conditions.

    Below the Windstopper front, a ProSecco Strada liner with its own zipper works to remove sweat and prevents you from getting wet and chilled from the inside. On hill repeats or intervals, unzipping the outer layer lets you cool your engine without forgoing all protection.

    Advanced patterning of the material allows for an excellent close-to-body fit, and the extra stretch at the waist keeps the fit sleek while a raw-edge waist lies flat and moves with you. A Castelli silicone text gripper at the waist keeps the jacket from riding up, and three rear pockets, with reflective laser-cut drain holes plus a front zippered pocket, carry everything you will need for a big day—and possibly damp—on the bike.

    Castelli calls this a jacket, but we think it's more than that. Perfect for intense rides in wet or variable weather conditions on cool days and windy rides, the Alpha ROS jacket offers protection that strikes just the right balance to keep you dry and comfy all day.

    • Versatile jacket for cool rides in wet or dry conditions
    • Windstopper membrane leads into rain and wind
    • Inner layer zips separately to tailor protection
    • Breathable back panels boost moisture evacuation
    • Slim fit perfect for group rides and early spring races
    • Reflective accents on pockets improve your visibility
    • Three rear pockets with drain holes stash ride snacks
    • Zippered front pocket adds secure storage
    • Item #CST00JG

    Tech Specs

    [front and sleeves] Windstopper 150, [back] Nano Flex Xtra Dry, [liner] ProSecco Strada
    spring, fall
    3 rear, 1 zippered front
    rear pockets
    Recommended Use
    road cycling
    Manufacturer Warranty
    1 year

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

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    Strange fit

    • Familiarity: I returned this product before using it
    • Fit: Runs small

    Runs small, particularly in the shoulders/chest area. Seems like the weird little under-shirt layer, which is sewn in, creates bunching in the chest area. Disappointing! I love a lot of other Castelli gear and usually found it to fit well.

    Small but Effective (and stylish)

    • Familiarity: I've used it several times
    • Fit: Runs small
    • Size Bought: Medium
    • Height: 5'3"
    • Weight: 130lbs

    I am a loyal Castelli customer and pretty much only wear Castelli on the bike. I always buy a medium. Some Castelli mediums are more snug than others. This medium is very snug in the shoulders and across the back - but I am ex-swimmer and still haul around larger than average shoulders. I will say that its smallness does not bother me when riding.

    Now - onto performance - its a great winter piece. I can layer a base layer top or light weight jersey under it and wear it for a 40-50 degree ride. I can put a performance wool t-neck under it and be completely comfortable on a 30-40 degree ride. It has perfect length coverage in the back. The arms are slightly long for me, but not bothersome, and I have shorter than average arms.
    Overall - a smart looking piece that keeps you stylish while being very versatile for different weather conditions.

    I have found the same thing to be true with the present Castelli jerseys and shorts. I have worn only Castelli for years and used to wear a small. I now find that most Medium jerseys are too tight. I have not gained weight although I have added width in my shoulders from lifting weights. I have mentioned this to the manufacturer as well.

    Runs extra small

    • Familiarity: I returned this product before using it

    Really cute and looks well made. Couldn’t even get it on. Im a size 6 in jeans and a small or medium in tee shirts. Im 5’6” and weigh 130 lbs. the medium was way too small. Im returning it for an XL and hope it fits 😳