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Castelli Core Mesh 3 Short-Sleeve Baselayer - Men's


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Core Mesh 3 Short-Sleeve Baselayer

Before you assume that all baselayers are created equal, take Castelli's Core Mesh 3 Short-Sleeve Baselayer out on a summer ride with an open mind. Rather than focusing on providing breathable insulation, a warm-weather baselayer like the Core Mesh 3 actually helps you stay cooler.

The crew-neck baselayer fits like a second skin, which allows its polyester mesh fabric to instantly pull moisture off your skin to keep you dry and cool as you heat up under an unforgiving sun and tempo. By sitting between your skin and your jersey, this fast-drying layer prevents damp fabric from chilling you when the breeze picks up in spring or weighing you down on hot summer days, regulating your temperature better than your skin alone.

  • Cool off by adding this airy baselayer to your kit drawer
  • Form-fitting cut keeps fabric continuously wicking moisture
  • Magic Mesh fabric blends ventilation with breathability
  • Nearly seamless construction for a chafe-free fit
  • Item #CST00G7

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

Tech Specs

What do you think about this product?


>Rating: 5

Better For Me In The Cold

I've put it through the wringer

I bought this Castelli Pro Mesh Baselayer two years ago for its advertised use as a warm weather undershirt, but that just didn't work out. It seemed to me, that the fabric trapped warm air next to your skin in the spaces between the mesh and your jersey and inhibited evaporation and cooling. Thinking that property might be better suited for cold weather, I tried using it as a base layer under various brands of long sleeve undershirts, and it worked great! The pockets in the mesh do trap your body heat under whatever covering you're wearing over it; for instance, a Craft, Castelli or Gore long sleeve undershirt and a Castelli Nelmezzo ROS jersey. That combination keeps me comfortable on the road from the upper 30's to the upper 40's. Below that I use a heavier undershirt over the mesh or put on a warmer winter jacket. For warmer winter temperatures (50-60 degrees), I'm comfortable in a Pro Mesh Baselayer under a lightweight undershirt and a short sleeve jersey with-or-without arm warmers depending on the temperature. For me, the mesh baselayer works so well in the cold that I now base my cold weather layering around it. In warm weather, however, it never sees the light of day. I'm 5'11' and weigh 165 pounds. A medium fits me as it should, nice and close.

>Rating: 2

poor sizing

I returned this product before using it
Runs small
Size Bought
6` 0"
172 lbs

bought the L/XL which typically fits in most brands . Shirt was way to restrictive to be comfortable. Had trouble getting it on and more trouble taking it off.

I'm about the same size as you (5'11"/173lbs) and normally take XL in Castelli. I have 2 of these in L/XL, wear them for all my summer rides, and find them extremely comfortable. The point of a fishnet like this is to trap air pockets between your jersey and your skin, and to do that it must sit snugly on the skin. Besides when you're on a bicycle your torso isn't moving around a lot as it does in many other activities. Yes putting it on can be a little tricky, but once it is on I don't notice them. WARNING: if you wash them in very hot water as I did by mistake the mesh turns brown, though the collar and hem stay white.

It fits proper. Your just not accustomed to this garmets feel. I am 5'11 175lbs and wear the same size your saying is too small. It took me a ride to get acclimated to it and get the knack for taking it off, but it fits.