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Castelli cares about body temperature—which is why they introduced the Uno Plasma Base Layer Shirt. Technical enough to extend the temperature range of your regular kit, and stylish enough to wear on its own, the Castelli Uno Plasma Base Layer Shirt is like purchasing a lease on comfortable weather.

  • Nano-plasma fabric moves moisture away from skin so you stay warm and dry
  • Minimal seams for ‘second-skin’ feel
  • Designed for and tested by the Cervelo Test Team

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Here's what others have to say...


Recommend this one.

    This base layer seems to keep me unusually warm (in a good way) for such a thin layer. Seem to do better than similar merino wool layers. I also tried using it on trainer in garage under a short sleeve jersey for sweat management and it worked well there too. Probably get the long sleeve version. I am 6 feet 1 inch, 163 pounds, large fits fine.

    Unanswered Question

    I see there is an XS size for this product....

    I see there is an XS size for this product. Do you happen to know what would be its "measurements"? Thanks a bunch!


    Works great

      This is my favorite base layer out of my recent purchase of three base layers. It keeps you dry and cool in hot weather yet even has the capability to keep you warm in cold weather. Wicks away moisture.