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Castelli Core Mesh 3 Sleeveless Baselayer - Men's


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Core Mesh 3 Sleeveless Baselayer

Castelli believes so much in the power of the fabric it uses to craft the Core Mesh 3 Sleeveless Baselayer that it deviated from its usual performance-related fabric monikers and named it Magic Mesh. Before you get skeptical about the fabric's otherworldly name, consider that the brand omitted all traces of less breathable Lycra when constructing the mesh, using only the most breathable polyester fibers to ensure maximum moisture management. By putting this featherweight layer under your summer jersey, you'll actually help speed up the rate at which moisture is pulled away from your skin to evaporate, helping you stay cooler and drier as you push through hot, humid air.

  • Wear more to stay cooler with this ultralight baselayer
  • Next-to-skin fit ensures constant moisture transfer
  • Airy mesh fabric made only with highly breathable polyester
  • Nearly seamless construction limits likelihood of chafing
  • Item #CST00G8

Magic Mesh (100% polyester)
Insulation Weight
Claimed Weight
Recommended Use
Manufacturer Warranty
1 year

Tech Specs

What do you think about this product?


>Rating: 4

Base layer for hot days

I've put it through the wringer
Runs small
Size Bought
6` 1"
165 lbs

I really enjoy this base layer when I know it will be a hot day in the saddle. Fit is very snug as other reviewers have commented. I also agree the torso is a tad long.

>Rating: 4

Excellent hot weather base

I've used it several times
Runs small

The open mesh design really works - it allows maximum moisture wicking without trapping any heat. I wear this on every hot ride. It hang-dries dries in 20 minutes after washing. The fit is...weird. It fits small, even for Castelli, so the traditional rule of sizing up one might not be enough for you. Even going up a size more than I would usually, it is a little hard to get on and off. Once I have it on, it fits snuggly but comfortably. I don't really notice it while riding. It's a little long for my taste.

>Rating: 3

Core mesh baselayer

Runs small
Size Bought
large / XL
5` 10"
154 lbs

The fit is tight, which I prefer. I didn't notice that it kept me cool - I wore it on a rainy day and the temp was about 80. My only problem with it is that the shoulder stitching is very thick and I could feel it digging into my skin under my form-fitting jersey for the first 20 miles.

>Rating: 4


Runs small
Size Bought

Thanks for the advice on getting a larger size. I have never owned a XXL in anything but even this is a very tight fit, I am normally a L and will even go XL on race fit. I haven’t had a chance to try in the heat but I’m not looking forward to pealing this wet base layer off. Definitely listen to advice and get one or two sizes larger!

>Rating: 5

Awesome. But runs very small.

Runs small

In my opinion, this fish-net vest is one of the best hot weather BLs made. But it runs very small. This innovative garment is designed to keep you cool in warm/hot weather by holding your jersey off your skin; allowing cool air to reach your skin, and sweat to evaporate more easily. It works! Wear this under your favorite Summer jersey and you *will* run cooler. It's pretty amazing. *Another note: the cut out around the neck is much improved over the previous version (previously it was way too small). Sizing. As Castelli vets know, usually size up +1 from your normal street size. Italian sizing is different. Here size up +2. Anyone else have the same experience here size wise?

I agree. I order an L/XL model and it runs extremely small. I'm 5'7'' and I would've never thought of ordering an XXL.