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CastelliIdro 2 Jacket - Men's

Item # CST00L4

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  • Black, S ($299.95)
  • Black, M ($299.95)
  • Black, L ($299.95)
  • Black, XL ($299.95)
  • Black, XXL ($299.95)
  • Black, 3XL ($299.95)
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Item # CST00L4

Mighty protection in a minimalist package.

Back for its second generation, the Castelli Men's Idro 2 Jacket retains the legendary waterproof protection and outstanding breathability of Gore-Tex's Shakedry membrane, but it's lighter than ever and features a subtle redesign in graphics along the backside. The Idro 2 Jacket builds on the successor's ultra-lightweight, highly compact shell by shaving approximately 16 grams from its design and taking up only half the space of a rear jersey pocket when it's folded inside.

Besides being lighter than an afternoon snack at a mere 107 grams, the Idro 2 Jacket retains the Gore-Tex Shakedry membrane, which places the waterproof, breathable membrane on the outside of the jacket, thereby preventing the chance of it wetting out when it's subjected to hours of heavy rain. And because Shakedry is one of the most breathable constructions in Gore-Tex's line, you'll enjoy won't feel like you're wearing a sweaty garbage bag, especially on long climbs where overheating is commonplace. It's rounded out with a waterproof YKK Vislon zipper, plus reflective highlights that pop on those dreary days with rain and ominous clouds.

  • Ultra-lightweight, highly compact rain shell
  • Sits close to body with dropped rear for protection
  • Takes up only half a jersey pocket when folded inside
  • Gore-Tex Shakedry won't wet out like traditional jackets
  • Shakedry membrane is reliably waterproof, highly breathable
  • YKK Vislon waterproof zipper won't allow water to leak in
  • Reflective rear elements pop when visibility is limited
Tech SpecsSize
Tech Specs
Gore-Tex Shakedry (2-layer)
reflective Castelli wordmark
Recommended Use
road cycling
Manufacturer Warranty
1 year


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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  • Familiarity: I've put it through the wringer

I ordered this jacket through Competitive Cyclist but noted that it was shipped by Back Country so I'm putting the review here. First things first - I'm not a big guy I have a 33 inch waist and I believe a 40" chest. In 95% of my clothes a medium fits me to a "T." I suspected that this might be a bit smallish so I ordered up to a size large and it fits like a condom. Kinda like it that way as it doesn't flap in the wind. You do have to take your gloves off to get it off your hands. Has a nice long tail to keep your butt dry and a big reflector on the back to keep cars from smashing you. I wouldn't even consider mountain biking with this coat unless it was on a nice wide double track where a crash could not happen or a snag on a tree branch.
I have a couple other Gortex "Shake Dry" coats and let me say that Gortex finally, after thirty years of trying, got it right. The membrane is on the outside and water always, always beads up like water on a duck's back. Give it a little shake and the water is gone. It DOES NOT WET OUT. Ever. Also no condensation builds up on the inside of the jacket. Your jersey may get damp but not excessively so. No rubber bag effect here.
Since the membrane is on the outside I highly recommend that when you stow this jacket you roll it up with the membrane on the inside to give it a little added protection in your jersey pocket or whereever else you may stow it. It rolls up to about the size of a hot dog (bun included) and easily stows just about anywhere. It is also light as a feather - mine weighs 4.0 ounces including the rubber band that keeps it rolled.

Awesome jacket !

    OK so the price tag is high BUT took this jacket out in a downpour ride last Saturday afternoon. Was on the bike for three hours and was bone dry on the inside. Not even a drop from sweat! Typical Castelli it runs small but once you know your size it a consistent fit. I’m 5”10, 180 lbs and wear and XL. It’s a great piece of kit and folds down to smaller bunch than my vest.