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Castelli Men

Castelli Men's Alpha ROS Jacket

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Determined to design a real-world waterproof jacket that ensures dryness and warmth without compromising breathability, proper fit, and style, Castelli created the Men’s Alpha ROS Jacket. This jacket features their original two layer alpha construction with a soft, insulating inner layer and a windproof yet breathable DWR-treated Gore® Windstopper® outer layer. Double stitching, selective seam sealing, and reduced seams overall deliver a warm yet breathable all-weather jacket that’s nearly impenetrable to water.

For a close but non-restrictive fit, this Jacket has a raw-edge waist that stays flat against the torso while still moving with the body. The cuffs feature raw-edge construction as well for smooth convergence with gloves. Stretchy fabrics paired with anatomic paneling ensure a snug fit that can accommodate a wider range of body sizes.

Features & Specs:

  • Gore® Windstopper® 150 outer shell.
  • Soft, insulating inner layer.
  • Nearly impenetrable to water.
  • Moisture wicking and ventilated.
  • Reduced seaming & seam sealing.
  • Double stitching.
  • Waterproof YKK® Vislon® zipper.
  • Raw-edge cuffs and waist.
  • Stretch and anatomic design yield snug yet accommodating fit.
  • Three rear elasticized pockets with reflective laser-cut drain holes.
  • Approx. Weight: 515g.

Castelli’s Rating System:

  • 5/5 windproof.
  • 5/5 insulation.
  • 4/5 waterproof.
  • 4/5 breathability.
  • 4/5 lightweight.

Sleeve Type: Long Sleeve 

Ordered by Most Relevant First
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Reviewed 12/17/2018
by Dave
Competitive Racer
SE Pennsylvania
Value Rating
Overall Rating
2 of 2 customers found this review helpful.
superb winter jacket

In the past I wasn't willing to spend this much for a jacket, but years of winter riding and not finding a kit that I have confidence in to keep me warm & dry in a range of conditions motivated me to try something new this year. After a lot of researching options I decided to give Castelli a try.

After a month of winter riding in a range of temps and terrains and getting caught in the rain once, I love this Alpha RoS jacket.

First impression was the fit. It's form-fitting, stretchy, and lightweight, blurring the line between a jersey and a jacket. The look & feel is like it's custom-tailored, perfect fit, no excess fabric anywhere, attention to detail that's a step above any other brand I've worn.

OK I'm sold on Castelli fit the moment I first put it on, but hard to believe this will keep me warm riding in 30's temps. But it does. This thing is a marvel of garment technology. It blocks the wind & insulates enough to keep me comfortable down to 28-30, and at the same time breathes & vents moisture like a much lighter garment. A couple of rides started in the 30's and ended in the 50's, and comfortable all the way through, no need to even unzip. Got caught in the rain, and watched the water bead and roll off. This isn't a all-day rain jacket because water will eventually get in around the neck & cuffs, but it kept me dry & warm for 2 hours in light rain & cold. No more worries about hypothermia if I get caught in a winter rain.

To take care of my legs too, with the Alpha RoS jacket I also got three different Castelli bib tights to cover the full range of temps. The jacket with my Sorpasso 2 Wind bib tights is awesome from high 20's through 40's. On slightly warmer days, 40's & 50's, the jacket is perfect with my Nanoflex Pro 2 bib tights.

One small complaint with the jacket is that even on dry days everything in the rear pockets gets soaked. Apparently the perspiration moisture that efficiently vents through the jacket condenses inside the pockets where it's colder. So I have to put stuff in ziplock bags. Since the jacket shell vents moisture so well, the pockets need to vent better to allow the moisture out. This is such an awesome jacket though that it's a minor issue.

For sizing, I suggest ignoring the Castelli sizing chart. The jacket and bib tights are a full size smaller than most brands. I'm 5'9, 155lbs, and normally wear size M. This jacket and the bib tights are all L, and they're as tight as the snug-fitting M kit I own. If I gained 10 lbs I'd have trouble getting into the jacket or tights. Order a size larger than you normally wear, and keep in mind that the Castelli cut is for a slim build, no extra volume built into the middle like American brands.

I gave one star less for Value just because it's pricey, but it's worth the premium and Castelli is my go-to brand going forward.

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