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Castelli Men

Men's Core Mesh 3 Sleeveless

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Core temperatures stabilized.

It might seem counter-intuitive to add a layer when the temperature is spiking, but with Castelli's Core Mesh 3 Sleeveless base layer wicking away your sweat away you'll never go back.

Designed for long miles in the height of summer Castelli opted to use their new Magic Mesh fabric, constructed from 100% polyester fibers for an incredibly breathable moisture-wicking fabric. Featuring a nearly seamless design to keep chafing to a minimum, this base layer sits next to your skin to provide constant moisture management.

Note: Castelli tops and bottoms are designed with a performance cut that often runs smaller than that of other manufacturers. Consider sizing-up one size to ensure a comfortable fit — e.g., if you normally wear a Medium, select a Large in Castelli. Feel free to contact us with any questions or concerns.

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.


Sleeve Type: Sleeveless 

White - S/M

Mfg PartNum: A17028001-2 

White - L/XL

Mfg PartNum: A17028001-4 

White - 2XL

Mfg PartNum: A17028001-6 

Ordered by Most Relevant First
5 stars
4 stars
3 stars
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1 stars
Quality Summer Base Layer
by Subi

Firstly, thanks to all the previous reviewers this item runs very small. I took the advice of others and bought 2XL and it fits perfectly, a little long but will tuck in nicely. I'm 5ft 10in, 37-38 chest 165 lbs. Usually medium rapha jersey, large castelli jersey and large pro castelli base layer. But this base layer just about fits like the large pro issue castelli which is for me a size up already. Other than sizing I can tell merely by the design that this base layer is what you want for a hot day above 85 degrees F. I wear the normal and sleeveless castelli pro base layer in 80- 85 degree weather but above that I feel hot. The pro castellibbase layer is thinner than the core 3 but the pro does not have actual openings between the mesh just varied thickness and is very thin. This is the next level with large mesh openings. Hope this helps.

Reviewed 7/30/2020
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Not a good buy
by Anonymous
Cycling Enthusiast
San Diego, CA

fits very tight and very uncomfortable was not a good buy for me

Reviewed 3/14/2020
TriSports.com Comments
Hi there, sorry this item didn't work out. Feel free to reach out to us to share some more details about your experience or arrange for an exchange. -The BTD Team
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a true base layer
by JDD
Cycling Enthusiast
Sonoma County, CA
1 of 1 customers found this review helpful.

The core mesh creates an isolating layer that promotes warmth in the cold and allows heatmoisture to escape when the morning ride heats up. It fits snuggly like all Castelli products. Only drawback is the tag placement on the side, needs to be removed.

Reviewed 9/16/2019
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Cool and tough underlayer - best underlayer I've owned.
by James
Cycling Enthusiast
Northern Virginia
2 of 2 customers found this review helpful.

Love the fit though it is cut extremely thin. I normally wear a small but had to get a large in this size.

Reviewed 8/31/2017
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