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Wicks, dries, and cools.

The Castelli Core Mesh Sleeveless Women's Base Layer is a sweltering summer specialist, actively wicking moisture to keep you cool on the hottest rides of the year. This sleeveless base layer fits effortlessly under your favorite jersey, facilitating wicking and evaporative cooling with its open-mesh construction. In fact, the jersey's open-mesh polyester fabric uses hollow core fibers for ultra-fast drying when you're working up a sweat, as well as an ultra-soft feel with ample stretch to maximize on-bike movements.

  • Open-cell mesh (100% polyester)
  • Anatomically contoured fit
  • Reviews
  • Q & A

Shockingly, it works!

    My wife was skeptical that another layer would keep her cool, but when she tried the Castelli Core Mesh Base Layer, she was a convert after the first long ride under the Southern-Utah sun. As promised, it provided excellent air circulation to maximize the power of evaporative cooling.

    It did shrink a bit after the first wash, so consider sizing up if you are unsure about size.

    Next Level Base Layer

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

    Castelli continues to amaze me with their A+ apparel. The Core Mesh Base Layer is no exception and has become my go-to on warm riding days.

    Unlike some other Castelli items, the sizing here is true--at 5'6" 145lbs, the medium fit well. The sleeveless design makes it easy to layer and the cut at the waist lays well under jerseys and bibs.

    Looks silly, works well

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

    Seems to really mitigate sweat accumulation, especially on mountain bike rides where the average speed is lower and tree cover impinges on the wind's ability to dry you out.