The Ultra Rain Bike Jacket from Castelli is for riders who need genuine storm protection without a bulky shell. It is fully waterproof and windproof, using Polartec Power Shield RPM, a two-layer stretch fabric engineered for temperatures in the 40s to 60s Fahrenheit. PFAS-free DWR treatment and fully taped seams lock out rain, while the fabric stays breathable and aerodynamic. It earns its place when you want to keep riding through wet, windy, darker-day conditions rather than wait for the weather to clear.

The Ultra Rain Bike Jacket offers full windproof protection front and back, so it blocks wind chill across your core and shoulders rather than only facing into the headwind. It is also fully waterproof, with a PFAS-free DWR treatment and taped seams that keep sustained rain out. For riders who start rides cold or face gusty, exposed conditions, this complete front-and-back wind coverage matters because it prevents the chill that builds when a jacket only shields one side.

Yes. The Ultra Rain Bike Jacket weighs just 167 grams and packs into its own internal pocket, so it stows easily in a jersey pocket or bike bag. This matters for riders who want storm-ready protection on hand without committing to wearing it the whole ride. On variable days, you can carry it, pull it out when the rain or wind arrives, and stuff it away again once conditions ease, keeping full waterproof coverage genuinely portable.

The Ultra Rain Bike Jacket is built for the 40s to 60s Fahrenheit range, using a minimal breathable two-layer stretch fabric rather than insulation. It protects against rain and wind, not deep cold. If most of your riding is in sub-freezing or genuinely cold conditions, you will want a thermal layer instead, such as the Velocity Thermal Bike Jacket or the Core Bike SubZ Bike Jacket. Riders in the Ultra Rain Bike Jacket's temperature band tend to find its waterproof, windproof build ideal for wet, cool weather.

If you ride in sustained rain and exposed wind, the Ultra Rain Bike Jacket from Castelli delivers true waterproofing with taped seams and full front-and-back windproofing. But if your need is lighter protection from brief showers and chill rather than genuine storm readiness, a packable wind shell may suit you better. The Mistral Packable Bike Jacket offers windproofing and light water repellency in a stuff-away format. Choose the Ultra Rain Bike Jacket when you expect real rain, not just the possibility of it.

There are two Ultra Rain Bike Jackets that share the same core Castelli Polartec Power Shield RPM waterproof and windproof construction. This is the electric blue, current-season version, called out with raglan sleeves and a longer 27-inch back for added road-spray coverage. The earlier version is offered in electric lime from the prior season. If you prefer the electric lime colorway, look for the earlier Ultra Rain Bike Jacket. Both deliver the same storm protection; the difference is colorway, season, and the detailed back-length and sleeve callouts here.

The Ultra Rain Bike Jacket is well suited to storm-ready commuting and wet-weather riding. Its fully taped seams and PFAS-free DWR lock out rain, the elongated back blocks road spray thrown up by your rear wheel, and reflective piping plus the electric blue hue keep you visible on darker, overcast days. For riders commuting through changeable conditions, the Ultra Rain Bike Jacket lets you keep riding when the weather turns rather than rearranging your schedule around it.

The Ultra Rain Bike Jacket has an athletic fit, cut close for an aerodynamic profile that suits active riding in the 40s to 60s Fahrenheit. Raglan sleeves support mobility through the shoulders, and the longer 27-inch back adds coverage against road spray when you are in a riding position. If you prefer a roomier, more relaxed fit or want room for a thermal layer underneath, size up. Riders who like a snug, performance-oriented feel will find the standard athletic sizing works as intended.

The Ultra Rain Bike Jacket uses Polartec Power Shield RPM, a minimal two-layer stretch fabric that stays breathable and aerodynamic rather than feeling like a stiff rain tarp. You get full waterproofing and front-and-back windproofing in a jacket that weighs only 167 grams and packs into its own pocket. For riders who want storm protection without sacrificing mobility or fit, the Ultra Rain Bike Jacket keeps you dry and wind-protected while still moving and breathing like a riding garment.