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CastelliSummer Skullcap

Item # CST00CB

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  • Black, One Size ($24.95)
  • White, One Size ($24.95)
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Item # CST00CB

Cool it.

When helmet padding just won't cut it to keep the sweat out of your eyes on mid-summer rides, don the Castelli Summer Skullcap to keep cool and dry. Made to sit unobtrusively under your helmet, this cap is constructed of a wicking layer around the headband to sop up sweat and keep your eyes sting-free. Across the top, a mesh layer provides oodles of ventilation and protects your dome from harmful sun rays for cool, worry-free miles.

  • Hot-weather skullcap that keeps sweaty discomfort at bay
  • Wicking mesh material breathes well and pulls sweat from skin
  • Form-fitting construction fits neatly under your helmet
Tech SpecsSize
Tech Specs
[top panel] mesh
Recommended Use
commuting, cyclocross, gravel, road cycling, triathlon
Manufacturer Warranty
1 year


Hand Circumference

< 7.2in

(< 18.4cm)

7.2 - 8in

(18.4 - 20.3cm)

8 - 8.7in

(20.3 - 22.2cm)

8.7 - 9.5in

(22.2 - 24.1cm)

9.5 - 10.2in

(24.1 - 26cm)

> 10.2in

(> 26cm)

Hand Circumference

< 6.5in

(< 16.6cm)

6.5 - 7.2in

(16.6 - 18.4cm)

7.2 - 7.9in

(18.4 - 20.2cm)

7.9 - 8.7in

(20.2 - 22cm)

> 8.7in

(> 22cm)

How to Measure:
Measure around the widest part of your hand, excluding the thumb.

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Ok but

  • Familiarity: I returned this product before using it

It is a one size unisex. It fit over my head but after a while it would just shrink back to its original size, and in shrinking, it would slip off my head. In short, it would not stay put. It seems to have worked for others but it did not for me and my quite bald head. Thank you

Have a hard time making it stay put

    I was hoping this will stop sweat from reaching my eyes. It has helped, but not as expected.

    stylish and effective

    • Familiarity: I've used it several times
    • Fit: True to size

    effectively mops up sweat , but more importantly blocks my head from the UV rays.

    Essential item if you are bald

    • Familiarity: I've used it several times
    • Fit: True to size

    This is a very lightweight skull cap that looks good and fits well. I started to wear this under my helmet to avoid the turtle shell pattern that develops on my bald head on sunny days. One added benefit: no more sweat dripping down the inside of my sunglasses.

    Favorite for Warm Rides

    • Familiarity: I've put it through the wringer
    • Fit: True to size

    The Castelli Summer Skullcap does exactly what it should under a helmet for riders (like me) with short or thin hair. It keeps sweat out of they eyes and off the glasses lenses, and keeps the sun off the scalp. The cap is nice and thin and all the stitching is flat-lock, so there is never any extra pressure or discomfort. It cools really well, to the point that it can feel chilly in temperatures under 65 or 70 degrees Fahrenheit. I have a couple of these!

    Great fit and feel

    • Familiarity: I've put it through the wringer
    • Fit: True to size

    I have a big head, and this thing fit just fine. It is nice to have one that is black because it doesn't show like a white one does through my helmet vents. I suppose in the summer it might retain heat from the sun, so I'll go back to my white ones exclusively for those months. I've owned previous versions of this brand and they've lasted through countless washings. Solid value and performance.

    No complaints

    • Familiarity: I've used it several times
    • Fit: True to size

    Good skull cap for summer. Very light weight. It does a decent job of keeping sweat out of your eyes when cycling.

    Excellent cap

    • Familiarity: I've put it through the wringer
    • Fit: True to size

    Great fit and quality. Best cap I own.

    better than headsweats

    • Familiarity: I've put it through the wringer
    • Fit: True to size
    • Size Bought: one size

    I have worn headsweats for years. This is a lot better material and quality. It does fit a little snug, I have a medium size head. I wear this to shelter head and thinning hair from the sun.

    Love - Hate

    • Fit: Runs small

    I love most ALL Castelli cycling wear, and own tons of it, from Alpha, Sorpasso tights down to several short sleeve jerseys and bib shorts, gloves, even toe thingys. But this Summer Skull Cap has way too much Lycra in it. It took both hands (wishing I had a third) just to stretch it out over my head. Once on it just wanted to pop off. Might work if you have a small head, mine's large (58 cm circumference) so this went back. Going to buy another Headsweats Eventure Skullcap in white to complement the one in red I already own.