Spring Clearance—Save up to 60% on components, clothing, accessories, & more »
  • Free Shipping on orders over $50*
  • 100% Guaranteed Returns

Castelli Core Mesh Men's Sleeveless Base Layer


Item # CST2598

4 5

Community Rating | 3 Reviews

  • 100% Guaranteed Returns

  • Free Shipping

    on orders over $50
Item # CST2598


It's like a shirt made out of air.

This is the sleeveless version of Castelli's Core Mesh Base Layer. And as with the short sleeve version, it incorporates an update to the classic fishnet style design. The older design used the holes of what felt like real fishnet in order to trap air between the skin and the second layer of clothing.

However, with the new fully-open mesh design, it still serves to hold the jersey off of the skin. Essentially, this creates a layer of air between your skin and the jersey in order to help you maintain a constant body temperature. But, besides these thermo-regulating properties, the improvements that Castelli brings to the table are several. The mesh is made from a polyester hollow core fiber that's soft-to-the-touch, efficiently wicks away moisture, and has ample stretch. In terms of shape, Castelli calls this 'body wrap,' because it's designed to wrap the body so that the gaps are only in the mesh, not between the mesh and the body. Accordingly, the entire base layer is mesh, save the hems and the 'V' that resides just below the collar.

The Core Mesh is cut long in order to stay comfortably tucked inside your shorts and bibs. Additionally, it was constructed with minimal seams for a maximum level of comfort.

The Castelli Core Mesh Sleeveless Base Layer is available in the color White and in the sizes Small/Medium, Large/X-Large, and XX-Large.

Tech Specs

[base layer] mesh
Recommended Use:
road cycling
Manufacturer Warranty:
30 days

Size chart


Men's Apparel

Castelli Men's Apparel
Jersey 35-37in
(88.9 - 94.0cm)
(94.0 - 99.1cm)
(99.1 - 104.1cm)
(104.1 - 109.2cm)
(109.2 - 114.3cm)
(114.3 - 116.8cm)
Waist 30-32in
(76.2 - 81.3cm)
(81.3 - 86.4cm)
(86.4 - 91.4cm)
(91.4 - 95.3cm)
(96.5 - 101.6cm)
(101.6 - 106.7cm)
(91.4 - 96.5cm)
(96.5 - 101.6cm)
(101.6 - 106.7cm)
(106.7 - 111.8cm)
(111.8 - 116.8cm)
(116.8 - 121.9cm)
How to Measure:
For best results, take measurements over your underwear.
Measure under your arms, around the fullest part of your chest.
Natural Waist:
Measure around your natural waistline, keeping the tape a bit loose.
Measure around the fullest part of your body at the top of your legs.
Using pants that fit well, measure the crotch seam to the bottom of the leg.
Measure from the center of your back to your wrist with arms held out.

What community has to say

What do you think of the

Castelli Core Mesh Men's Sleeveless Base Layer

? Share a...

Write a review

No file chosen

Rather attach a photo from another website?

Rather attach a photo from your computer?

  • Product review:
  • Share a video
  • Share a photo

How familiar are you with the product?(Optional)

Invalid filetype.


Here's what others have to say...

2 5

neck too small,

  • Familiarity: I returned this product before using it

no matter what body size, xl, 2-3 xl, SS or sleveless.
I'm 165, 5'9, 31 waist, 44 chest (push ups).. No one seems to know if there's a reason for the neck to be so tight. I have average 17", so they all went back. Looking at http://www.backcountry.com/castelli-airco-base-layer-short-sleeve-mens?ti=U2VhcmNoIFJlc3VsdHM6bWVucyBiYXNlIGxheWVyIHRvcHM6MTo0Om1lbnMgYmFzZSBsYXllciB0b3Bz
maybe will do the job. The open net did add some warmth as an extra layer next to skin though.

5 5

Helps me beat the heat

  • Familiarity: I've put it through the wringer

This base layer is must have for riding in warmer temps. Anything 80 degrees and above and this thing is on under my jersey. Essentially it's like having air conditioning during the ride because it creates room for air to flow between your jersey and your skin. The faster you ride, the cooler you feel. I own this model and the seamless version and prefer the seamless, but they both work great.

I wash this base layer by hand in the sink and air dry - do not put in the dryer. Also size down for a close to skin feel. You don't want this to fit lose on you. And be prepared for your wife to laugh at you and make fun of you if she sees you walking around the house with this on.

Quality Castelli construction too. I end up washing my right after my ride so I can have it ready again to ride the next day.

4 5

Works great

Performance: This fish-net style base layer is very effective in warm weather (just like B7 says above).

1. Opening for the head is very small. Take care putting this baselayer over your head.

2. Ok, I know it's a small world now. But the day an iconic and historic manufacturer of Italian cycle clothing is made in El Salvador, something is wrong. ... I love Castelli gear. This is a famous company that makes an astounding range of superb pro-level cycle clothing. The function and style of Castelli gear is uniformly fantastic. But I also own a lot of excellent gear by Santini and De Marchi; all of it made in Italy. Castelli is asking $45 for two ounces of nylon mesh made in El Salvador? Really? Can't Castelli manufacture this base layer garment -anywhere- in the EU for a decent price? Maybe in Romania (like Campagnolo and Sidi) or Bulgaria (like Assos). Castelli high-end gear should at least be made in Europe. One star off for egregious outsourcing.