The Castelli Pro Fit Light Rain Jacket was made for Team Ineos, meaning it's pro-level quality. The high-stretch fabrics with a smooth face make this the most aero race option in Castelli's lineup. But it's good for so much more: it's packable and fits in a jersey pocket, it's fully waterproof and seam-sealed to keep the rain out, and it features a long tail to protect you from wheel-spray, while the external pockets are handy for stashing food. The sleeves have a three-layer fabric for comfort on the skin, while the inner textile layer is eliminated on the main body to save weight and keep the piece compact for packability. The downside is that the PU membrane means it isn't as breathable as a Perfetto or Gabba, so this isn't as good for long, steady medium-intensity rides. Oh, and keep in mind that it's cut for a skin-tight fit on WorldTour riders