Here's a brilliant idea: take a traditional cotton cycling cap, favoured by many cyclists in the autumn and winter months whether worn under a helmet or on its own, and make it from a waterproof fabric for the ultimate wet weather protection. It's a simple idea well executed in this Showers Pass eVent cap.
The cap, from Portland-based Showers Pass, is constructed from a three-layer eVent fabric. This ensures it's completely waterproof, and will keep your head dry even in the pounding rain. It fits easily under a helmet, or can be worn on its own, whatever your preference. It performs well in both modes.

Showers Pass make just one size and it's good for heads sized between 52 and 60cm. The one size fits all approach might cause issues for those at the extremes of head size, but my regularly sized head fitted inside it without complaint. The stretch head band provides a nice snug fit, not too tight nor too baggy.
I'm a cotton cap fan. They're a regular go-to item when dressing for a cycle ride at this time of year. They're not much cop in the rain though. Not the case with the Showers Pass eVent cap, it is simply brilliant in the rain, keeping your head dry for the entirety of the ride. It's perfectly breathable too, and even on a ride when it didn't rain I didn't notice undue heat build-up.

It doesn't offer much insulation though, it's not lined, so it's not as useful on colder rides as it could be. That's perhaps its only fault, but it's not designed to provide warmth, it's designed to keep you dry in the rain. And that it does outstandingly well. A great investment for wet weather cycling.
If you're determined to ride in the rain, the Showers Pass eVent cap will keep your head completely dry. It's breathable enough to avoid overheating and is useful even on rides when it doesn't rain much, but you might get the occasional shower
Verdict
Simply brilliant waterproof cycling cap with good fit and breathability
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road.cc test report
Make and model: Showers Pass eVent cap
Tell us what the product is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?
A fully waterproof cycling cap made from the highly regarded eVent 3 layer waterproof fabric, the Showers Pass eVent Cap is finished in a classic style with a one size fit, and is designed to fit under your cycling helmet for protection against mid-ride downpours.
Tell us some more about the technical aspects of the product?
3 layer waterproof
Fits head 52cm - 60cm
One size fits (nearly) all
Rate the product for quality of construction:
8/10
Rate the product for performance:
9/10
Rate the product for durability:
8/10
Rate the product for comfort, if applicable:
8/10
Fits well under a helmet. Comfortable on its own too
Rate the product for value:
8/10
Tell us how the product performed overall when used for its designed purpose
Avoids a soggy head which makes riding in the rain a little less unpleasant.
Tell us what you particularly liked about the product
Fit and waterproofness.
Tell us what you particularly disliked about the product
One size for all won't suit those people at the extremes of the fit range.
Did you enjoy using the product? Yes.
Would you consider buying the product? Yes.
Would you recommend the product to a friend? Yes.
Anything further to say about the product in conclusion?
Extremely useful for wet weather cycling and breathable enough to wear even when it's not raining
Age: 31 Height: 180 Weight: 67
I usually ride: My best bike is:
I've been riding for: 10-20 years I ride: Every day I would class myself as: Expert
I regularly do the following types of riding: road racing, time trialling, cyclo cross, commuting, touring, mtb,
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