Castelli Castelli Idro 3 Jacket Black S
Castelli Castelli Idro 3 Jacket Black

Castelli Idro 3 Jacket Black

The lightest and most packable fully waterproof Castelli GORE-TEX® jacket
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This jacket is a game changer. To call it a rain jacket is only touching the surface.

Idro is Italian for hydro, meaning having to do with water. Or in this case, keeping water from coming in while letting sweat escape. It does both very, very well. The 3 in the name indicates this is the third iteration of this product, nearing the maximum of what's possible with a shell jacket.

There's a big innovation on the back, with a large high-stretch GORE-TEX® panel that allows us to give the jacket a trim fit (i.e., no flapping fabric, so you can just ride away from your riding companions), yet the jacket expands to fit around loaded pockets — or to fit normal people with a bit of a gut. Beyond the stretch panel, Castelli carefully refined the fit, the finishing construction, the large reflective panels, and especially the wrist closures with a new internal gaiter.

Castelli made this jacket to be as fully featured as possible when you wear it, but it will spend a lot of time in a pocket on those days when it might rain or when you just need it to cover up on long alpine descents. It weighs less than many jerseys and stashes away to occupy only half a jersey pocket. There is one drawback: the fabric is so lightweight that it is a little bit fragile, so treat it with care. It'll be one of the most important pieces in your cycling wardrobe.

  • The lightest and most packable fully waterproof Castelli GORE-TEX® jacket
  • GORE-TEX® SHAKEDRY™ product technology sheds water yet offers unmatched breathability
  • The entire lower back is in GORE-TEX® Topo stretch fabric to expand in diameter if you have a few extra winter kilos or full pockets
  • Reflective tape on back of both sleeves for high visibility in low-light conditions
  • YKK® Vislon® waterproof zipper slides easily for ventilation adjustments
  • Internal wrist gaiter seals wrist and integrates with glove to keep water out

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