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Layer with strategy.

It's tempting to ditch every extra layer as soon as the sun comes out and late spring officially takes hold, but riding with a baselayer can still make a big difference in temperature management and breathability. On a warm spring morning with a cool breeze, layer the Castelli Pro Mesh Sleeveless Baselayer under your jersey. Rather than being weighed down by the extra layer, you'll enjoy faster moisture transfer with the addition of ultralight mesh fabric next to your skin, helping you stay drier as you heat up in variable temps.

  • Ultralight baselayer improves breathability on your rides
  • Form-fitting cut won't ride up under a jersey and shorts
  • Airy mesh fabric keeps moisture off your skin
  • Reviews
  • Q & A


  • Familiarity: I've used it several times
  • Fit: True to size

Great for summer, I live In Puerto Rico and this is one of the best baselayer out there and for the price, is unbeatable . Fit well under the jersey and it does the job well with the sweat. Looks cool when you open the jersey too :)


  • Familiarity: I've put it through the wringer

Great summer base layer. Fits well under a jersey and does a great job wicking moisture. The colors are great are stand out in a sea of white, black, and grey baselayers. You'll look forward to zipping down your jersey to display it on the climbs!

Stylish base layer!

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: Small

These are pretty cool and work like a summer base layer should. My favorite thing about them is the style. The fit is true for me, but I like tighter cycling clothes. Fits well under a nice Free Aero Race jersey! Highly recommend. The only knock I have is the quality may be a step below the top of the line, but great value at this price.

The Castelli products vary in quality

  • Familiarity: I returned this product before using it

I was just in Barcelona and picked up a Castelli kit which fits great. Because of a decrease in quality in the US I had stopped using Castelli products about 10 years ago. To use with my new kit I purchased this undergarment and it does not fit great and even the material did not feel great, it's not made in Europe. My guess is that the Romanian factories doe a better job and get better material than the ones in Latin America?... and they cost the same her than in Europe... I will not purchase Castelli made in Latin America.

Snug fit—euro sizing

    Consider ordering a size up as these run small. I do love this brand—their stuff is solid and holds up well.

    Fantastic baselayer

    • Familiarity: I've put it through the wringer

    Great garment. I love the designs, even if most people aren't going to see it. For me, it didn't run as small as I was expecting, but I wouldn't size down. I've used this on super hot days under a jersey, and it worked out well to keep me cooler, as well as cooler days for an extra layer.

    Basel Layer - awesome piece

    • Familiarity: I've used it several times
    • Fit: Runs small
    • Size Bought: Large

    Awesome piece to add to your cycling attire

    Castelli sleeveless base layer

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

    Great for summer rides. I bought XXL but should have gone with XL. I plan on ordering more in the future.


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

    Love to get a little crazy with your kit color palette but don't want the world to see? This may be the item you are looking for. Oh and it wicks away moisture to keep you cool and all that other fancy stuff. Here is the tricky part, most people size up for Castelli but I have found that that with their base layers they fit true to size.