Free 2-Day Shipping on Orders Over $50 100% Guaranteed Returns
Memorial Day Sale
Castelli Pro Mesh Sleeveless Baselayer - Men's

Item # CST00KL

Select options
  • Select options
  • Gray, S ($59.95)
  • Gray, M ($59.95)
  • Gray, L ($59.95)
  • Gray, XL ($59.95)
  • Gray, XXL ($59.95)
  • Orange, S ($59.95)
  • Orange, M ($59.95)
  • Orange, L ($59.95)
  • Orange, XL ($59.95)
  • Orange, XXL ($59.95)
  • Pro Green, S ($59.95)
  • Pro Green, M ($59.95)
  • Pro Green, L ($59.95)
  • Pro Green, XXL ($59.95)
  • Sky Blue, S ($59.95)
  • Sky Blue, M ($59.95)
  • Sky Blue, L ($59.95)
  • Sky Blue, XL ($59.95)
  • Sky Blue, XXL ($59.95)
  • 100% Guaranteed Returns
  • Free 2-Day Shipping
    on orders over $50

Item # CST00KL


Strategical layering companion.

Layering isn't just for freezing-cold rides, it's actually a strategic way to actively manage your core temperature and curb excessive sweating when it's warm outside. Proving this point, the Castelli Men's Pro Mesh Sleeveless Baselayer effortlessly layers underneath a myriad of cycling jerseys to regulate your body temperature and manage moisture, regardless if you're suiting up for frigid conditions with a thermal long-sleeve or riding through sweltering weather in your lightest, most breathable jersey.

Castelli's 3D mesh fabric remains cool-wearing and comfortable underneath your favorite jerseys and actively pulls moisture off your body to keep you cooler in summer and warmer in chilly transitional seasons, such as late-autumn and spring. It sits tightly against your skin, which further aides in its ability to pull sweat off your body and features a hem that lies flat underneath your shorts. Additionally, it's finished with vivid sublimated graphics for extra flair when you unzip your jersey for ventilation or even take it off at the cafe afterwards.

  • Strategical layering top regulates your body temperature
  • 3D mesh fabric actively manages moisture as you start to sweat
  • Sleeveless, form-fitting design easily layers under most jerseys
  • Hem lies flat underneath your shorts to prevent bunching
  • Vivid sublimated graphics pop with colorful flair

Tech Specs

3D mesh fabric
sleeveless base layer
Claimed Weight:
46 g
Recommended Use:
road cycling
Manufacturer Warranty:
1 year

Size Chart


Men's Apparel
Chest 36.2in
Waist 31.5in
Hip 37in
Inseam 31.9in
How to Measure:
For best results, take measurements over your underwear.
Measure under your arms, around the fullest part of your chest.
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.

Reviews & Community


Write a review

    Add a:
  • Photos
  • Videos

No file chosen

Rather attach a photo from your computer?


Product Fit:

Runs smallTrue to sizeRuns large

Add Your Size


Height (ft, in):

Weight (lbs):

Size Purchased:

Only jpg, jpeg, png, gif or bmp files please.

Submit ReviewCancel

Castelli Pro Mesh Sleeveless Baselayer

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Large

Does what a sleeveless baselayer should - soaks up sweat. The grey is a nice neutral color that goes with everything. It's a bit short for me but as it is, doesn't really affect it's performance, i just wish it were 1-2" longer (I even tried an XL and it wasn't noticeably longer just baggier).

A note on my experiences with Castelli sizing: yes, normally I size up. Jerseys I am XL, socks XXL, I still have no idea on bibs as I haven't even attempted it, warmers have also been a problem (I'm thinking the sizing is similar to the baselayers?). Their baselayers appear to be 'true-to-size' but YMMV. I ended up keeping the Large over the XL, largely based on others comments I ordered both because I wasn't sure. Hopefully this saves someone the trouble.

Great Base Layer

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Large

I have been a fan of these base layers from Castelli for some time. I almost always wear a base layer (even in the summer) and these are an excellent length, weight, and fit - plus a little accent color never hurts!

Just a note on fit - I wear an XL in the Castelli aero race jersey but size down in the base layer to a Large - not sure if the same dynamic holds true in the smaller sizes but you may want to consider one size down to have a snug fit.