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Your summer jersey becomes a spring jersey when you add the Castelli Uno Plasma Base Layer. The Uno Plasma is designed to transfer moisture away from skin so you stay dry—a fundamental element in your battle against weather.

  • Minimal seams prevent skin irritation
  • Stylish, simple design for a fashionable ride

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    When I took it out of the package, I wasn't impressed. Looked like just a simple t-shirt. However, once you put it on and put additional layers over the top, you hardly know you have it on. But, you can definitely tell it works as advertised as I kept dry and warm throughout my ride.