Free 2-Day Shipping on Orders Over $50 100% Guaranteed Returns
Save 25% or More on Castelli
Castelli Pro Mesh Sleeveless Baselayer - Men's
Sale $38.97 - $41.96 $59.95 35% Off

Item # CST00G6

Select options
  • Select options
  • Multicolor Blue, XS ($38.97)
  • Multicolor Blue, S ($41.96)
  • Multicolor Blue, M ($41.96)
  • Multicolor Blue, XXL ($41.96)
  • Multicolor Fluo, XS ($38.97)
  • Multicolor Fluo, S ($41.96)
  • Multicolor Fluo, M ($41.96)
  • Multicolor Fluo, L ($41.96)
  • Multicolor Gray, XS ($38.97)
  • Multicolor Gray, S ($41.96)
  • Multicolor Gray, L ($41.96)
  • Multicolor Gray, XXL ($41.96)
  • 100% Guaranteed Returns
  • Free 2-Day Shipping
    on orders over $50

Item # CST00G6


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

Tech Specs

3D mesh
Insulation Weight:
sleeveless crew
Claimed Weight:
Recommended Use:
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
Avg. ride time: 2h 1m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

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

    Avg. ride time: 1h 39m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    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.