Just like the name says, Castelli wanted to create the ideal simple emergency rain jacket. They made it completely waterproof and compact, and, as you’d expect from Castelli, they also gave it an amazing on-bike fit, yet it’s still roomy enough to fit over a Gabba. It has all the trappings of a performance rain jacket, with the waterproof zipper, long tail, long sleeves, and wrist closures that can go over gloves.