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Castelli Mens Alpha Doppio RoS Jacket
Castelli Mens Alpha Doppio RoS Jacket
Castelli Mens Alpha Doppio RoS Jacket
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Castelli Mens Alpha Doppio RoS Jacket 1
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Castelli Men's Alpha Doppio RoS Jacket

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MSRP: $399.99
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Make It A Double

The Castelli Men's Alpha Doppio RoS Jacket is a top-rated winter jacket, bringing warmth, breathability, and a high level of rain protection along with a soft, comfortable fit. This jacket leads the way in demonstrating how a winter jacket should perform.

Even the best of the currently available fabrics provide a good level of breathability but can't keep up with the sweat generated during high-intensity riding. So Castelli invented a double-layer construction that allows you to open an outer wind-protection layer while keeping the insulation layer closed and thereby allowing airflow inside the jacket to evacuate moisture while avoiding direct contact with the skin. On a long climb you can completely open the outer layer to allow moisture to escape, and close the outer layer on descents to remain completely dry inside. It works so well that sometimes it feels like magic.

The Next Generation Alpha

For this next generation, Castelli used a softer, warmer Polartec® Alpha Direct insulating layer. Next, they made small changes to the openings: neck, waist, and, most of all, wrists. The neck comes up high and is shaped to move with you, whether you're standing or in an aero position being a January hero and attacking your mates. For the waist, they've created a stretch layer with a silicone bead that lies flat and completely seals out wind without bunching or riding up. They've made some updates to the double-layer wrist opening, with an inner layer that goes under your glove that seals tight to your wrist, and an outer layer that goes over your glove so that any rain will roll down the outside of the glove and not end up inside.

This jacket will also hold up well in wet conditions, so they used GORE-TEX INFINIUM™ WINDSTOPPER® fabric along with waterproof seam taping on critical seams around the shoulders. Other seams are hidden out of direct water flow, and the water-repellent treatment on the fabric is sufficient to prevent most moisture from entering. They call it "essentially waterproof," using a balance between water protection, breathability, and comfort. It doesn't mean that no drop will ever come in, but on longish rides in real rain you can stay completely dry. All these features make it a favorite of Castelli staff and ambassadors, and the most versatileperformance jacket for cold-weather training they've ever created.


  • Rain or Shine engineering makes this their best jacket ever for dry conditions while providing significant rain protection
  • GORE-TEX INFINIUM™ WINDSTOPPER® 150 fabric for wind protection with high breathability and effective rain protection
  • Double-layer Alpha construction with Polartec® Alpha Direct insulating layer separate from wind/water barrier to let you regulate temperature and ventilation
  • Reduced seaming with seam sealing on shoulders reduces chances for water to enter through stitching
  • Off-set Water-resistant YKK® Vislon® zipper slides easily for better regulation of airflow
  • Raw-edge waist with silicone gripper lies flat and seals out wind
  • Double-layer cuff integrates with gloves to prevent cold wind or water from entering at wrist
  • Stretch fabrics with advanced patterning make for an excellent close-to-body fit that still accommodates a wide range of body types
  • Back ventilation
  • 3 rear pockets with reflective laser-cut drain holes
  • Zippered secure front pocket for valuables
  • Weight: 415g
  • Temperature:-5°C - 10°C / 23°F - 50°F

Free Exchanges: This product qualifies for free exchanges within the first 60 days after order. We'll cover the shipping both ways for US customers if you need a different size and/or color of this product. Returned product must be in new condition with all labels and packaging. Free exchanges apply only for product in stock or available for backorder.

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

Size Chart




Sleeve Type: Long Sleeve 

Light Black/Silver Reflex-Dark Gray - Small

Mfg PartNum: B4523505085-2 

Light Black/Silver Reflex-Dark Gray - Medium

Mfg PartNum: B4523505085-3 

Light Black/Silver Reflex-Dark Gray - Large

Mfg PartNum: B4523505085-4 

Light Black/Silver Reflex-Dark Gray - X-Large

Mfg PartNum: B4523505085-5 

Light Black/Silver Reflex-Dark Gray - 2X-Large

Mfg PartNum: B4523505085-6 


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This is an amazing product!
by Anonymous
Daily Commuter
St. Louis, MO

This is a very warm but breathable item. It is very versatile - I have worn it from 35 F to 60 F.

Reviewed 4/1/2024
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