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Castelli Difesa Thermal Cap



Castelli's autumn/spring hat is plenty warm enough even without windproofing, but one size may not fit all...

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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Castelli said it wanted to make a lighter thermal hat, and that's what it's done with the Difesa Thermal cap, at the price of some windproofing.

  • Pros: Good looking, traditional style, warm and breathable
  • Cons: Not as warm over the ears as some, one size won't fit all

The early arrival of winter (we had a good covering of snow in October in County Durham) means I've had a chance to wear the Castelli Difesa in a range of conditions that you might expect in the down-season, and while it's not as warm as an all-out waterproof/windproof cap, it provides a good degree of protection. Even in persistent Lake District rain it kept my head warm, though it was sopping wet by the end of the day.

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The cap bit is made from something called Thermoflex Core2. This is thin and lightly fleecy on the inside, which makes it warmer than it looks. The half-wool, half-acrylic knitted ear-cover is comfortable and warm on still days but lets a noticeable draught through on cold, windy days. If you suffer from cold ears you might want an all-windproof design, such as Castelli's Difesa 2.

Castelli Difesa Thermal Cap - back.jpg

When worn without a helmet, the cap sits securely, thanks to its elasticated fit, but I did feel a bit of pressure against my forehead from the inner edge of the peak. My head is 58cm and I wouldn't have wanted the hat any tighter.

Castelli Difesa Thermal Cap 2.jpg

Under a helmet the thin fabric meant it didn't take up too much space and there was still enough room to push the earwarmer up a bit if needed. If I tried folding it up, though, I couldn't get my helmet on.

> 30 of the best pieces of cycling clothing to keep you warm this winter

The peak was useful and flipped up and down in positive fashion, staying where it was put. 

Castelli Difesa Thermal Cap - peak.jpg

The Difesa Thermal comes with a choice of lining colours – red or blue – but you'd have to wear it inside out for anyone to notice this.


Castelli's autumn/spring hat is plenty warm enough even without windproofing, but one size may not fit all... test report

Make and model: Castelli Difesa Thermal Cap

Size tested: One

Tell us what the product is for

From Castelli's website:

Our original Difesa cap is a Windstopper® piece that's best for extreme conditions.

With the Difesa Thermal we take away the windproofing, but by doing so dramatically improve the moisture management, so it's best for cool to cold conditions, especially with high-intensity riding.

We place a rib-knit wool wrap around the ears to keep you warm but keep it all relatively thin to fit under a helmet.

Tell us some more about the technical aspects of the product?

Thermoflex Core2 fabric on body of cap for warmth and optimal wicking to move moisture away from your skin

Wool-blend ear cover

Classic fit with vintage appeal

Rate the product for quality of construction:

The four-panel cap is double-stitched inside. The ear cover and peak attach with two lines of simple stitching.

Rate the product for performance:

Most of the time this autumn this cap has been very welcome. It's warm enough for quite cold days, but the lack of windproofing in the ear cover is noticable in a cold breeze. Though not waterproof, it does keep the elements at bay.

Rate the product for durability:

This is well-made and not just your average cloth cap. I don't see any reason why it shouldn't last a few winters.

Rate the product for fit:

Fine for me; my head is not unusually large at 58cm but it was quite tight so if you're much over that you might have trouble.

Rate the product for sizing:

One size only.

Rate the product for weight:

A beanie-style might save a bit of weight over a peaked cap, but then it's a different kind of hat.

Rate the product for comfort:

Generally good, though as mentioned slightly tight. The knitted earcover isn't as wind resistant as I might have liked.

Rate the product for value:

Dearer than many a cap, but more sophisticated too. It's £10 more than similar offerings from Lusso and Prendas (see below), but does a slightly different job.

How easy is the product to care for? How did it respond to being washed?

Went through the wash without trouble.

Tell us how the product performed overall when used for its designed purpose

Good on cool-to-cold days. If there was any sunshine it got a bit hot on the climbs, but hey! you can take it off. Remarkably resistant to foul weather.

Tell us what you particularly liked about the product

Warm under a helmet, the peak was useful and stayed where it was put. Smart Italian flag on the peak.

Tell us what you particularly disliked about the product

The inside edge of the peak pressed into my forehead a little – an issue with the overall sizing, perhaps.

How does the price compare to that of similar products in the market, including ones recently tested on

There's a lot more going on here than in a simple cotton cap, so compare it to the likes of the Prendas Sublimated Pro or the Lusso Repel; it's a tenner more than both.

Did you enjoy using the product? Yes

Would you consider buying the product? Yes

Would you recommend the product to a friend? Yes

Use this box to explain your overall score

If it fits, it's well worth considering. It's quite versatile, has a good peak, fits well under a helmet and is secure without; a little too secure, perhaps, if you have a large head. I've been reaching for it lots this autumn.

Overall rating: 7/10

About the tester

Age: 52  Height: 6'2  Weight: 73kg and holding steady

I usually ride: Cannondale CAAD10   My best bike is: Tomassini Prestige

I've been riding for: Over 20 years  I ride: A few times a week  I would class myself as: Experienced

I regularly do the following types of riding: touring, sportives, general fitness riding, mountain biking

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