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Summer Skullcap

3.8333333333333335 out of 5 stars
6 Reviews

Out of Stock

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Summer Skullcap

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
  • Item #CST00CB
synthetic mesh
commuting, cyclocross, gravel, road cycling, triathlon
Manufacturer Warranty
1 year

Overall Rating

4 based on 6 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 1 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 4 reviews

Fits Slightly Small

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

April 26, 2022

Fits My Smaller Size Head

I've used it once or twice and have initial impressions
5' 6"

I'm always concerned with hats or anything on my head as the sizing always runs a bit big. This one feels snug. I don't think I placed it correctly the first time and it came loose. I haven't had a chance to test it out in warm/hot conditions yet to know how well it wicks moisture. It's been relatively cool in the mornings right now.

David M
1 out of 5 stars

December 23, 2021

Fits Small

I returned this product before using it
Size Bought:

Couldn't do it&..had to return it. My head size 23.5" ~ 60 cm

Ricardo A
5 out of 5 stars

October 16, 2021

Helps with sweat management

I've put it through the wringer

Love having these skull caps for riding, weather it's summer or winter, it helps keep the sweat out of your face and eyes. Stretches a bit over use, but that's years of use. So for the price, it's a great investment, as this is my second Castelli skull cap. This is really meant for warmer weather, as it only covers your head and doesn't come down over your ears. But does great with that.

5 out of 5 stars

October 4, 2021

Great Skullcap for warmer months

I've used it several times
Size Bought:
5' 11"

This skullcap fits comfortably and kept the sweat out of my eyes. I have yet to use this skullcap on a real hot (90F) day, but so far on 70-80F rides it has kept my head cool and sweat at bay. I wear a large size helmet and found no issues with the single size. I read other reviews and all mentioned a sizing issue as this is a one size product.. perhaps this is no longer the case.

Marc W
5 out of 5 stars

August 6, 2021

Works as intended for me

I've put it through the wringer

Works nicely to keep sweat out of my eyes and sunglasses. I also have a few of the Giro skull caps, but I prefer the thinner material of the Castelli cap for hot summer weather. Also, the Castelli cap lays flat and smooth under the helmet, whereas the Giro has two pronounced seams which may affect fit or comfort for some. A note on sizing: As others have stated, this cap fits tightly, but Castelli may have recently adjusted the sizing, as my second one of these has a more forgiving fit. The first was uncomfortably tight, but it stretched out after several uses/wash cycles and is very comfortable now. For reference I wear a POC Omne Air Spin helmet size M. Head circumference is 57.5cm.

2 out of 5 stars

August 28, 2020

Too small just as others reported

I returned this product before using it

I also use Medium size helmets (with plenty of spare room for balaclava plus hat in the winter) - this one is very small for me almost immediately resulting in a headache. I like Castelli race fit tight jerseys and bibs, but in headgear too tight is a problem. If you have a small head, it looks to be decent quality. Otherwise Castelli Bandana is not bad.

Michael E

Originally reviewed on Backcountry.com