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.  Deluge Light 2.5-layer waterproof fabric keeps rain off with 10,000 mm water column Slight amount of stretch for excellent fit in riding position Folds into half a jersey pocket for emergency situations Stuff pocket integrated into mesh vent at top of back Waterproof zipper and contrast seam sealing keep water out 360° reflectivity