Bright layers.

Even the most classic, highly styled, muted colorway benefits from a pop of color under the collar, and Castelli delivers the finishing touch on its Chpt. III cycling kit collaboration with the Men's 1.81 Baselayer. With a pattern derived from the overlapping colors of David Millar's ride data gathered at his final race in the 17th stage of 2014's Vuelta a Espana, this baselayer features splashes of red and print detailing to honor the race it was inspired by. Made from lightweight mesh, this piece sits slim under any jersey to provide stylish temperature regulation in a variety of temperatures.

  • A lightweight, brightly styled baselayer
  • 3D mesh fabric wicks moisture out and away
  • Streamlined fit for clean jersey lines
  • Sized by suit jacket size instead of standard XS-XL sizing
  • Reviews
  • Q & A

Size in numbers...but description is in letters
Pls explain...


The Number sizing is based off of chest size, You can then measure that based on the letter measurement in the size chart, if you don't know your chest size.