Hyper-light and totally waterproof, the Idro Jacket raises the bar for a high-performance cycling shell. You can stuff it into an already packed jersey pocket, and it weighs in at 107 grams (lighter than any smartphone). The miracle is the game-changing fabric that puts the super breathable membrane on the outside. The unique system means the fabric won't absorb moisture and doesn't require DWR treating, yet it's still incredibly breathable.

• GORE-TEX® Active Shakedry 2-layer fabric has an external membrane for breathability, waterproofing and weight reduction.

• Fully taped seams.

• Full-length water-resistant YKK Vislon zipper.

• Anatomic, shaped cuffs and hem with low-profile elastic binding for a secure fit.

• Reflective elements for low-light visibility.

• Streamlined, slim fit is optimized for the ride position.

• Castelli recommends this jacket for temperatures between 6 and 20°C.