The Ultra-Lite has been designed as an emergency jacket against sudden rain and the hyperthermic chill of changing weather or a cold mountain descent. It easily packs into a jersey pocket, so it can be conveniently included with every ride.
While the stretch fabric is completely waterproof, the Ultra-Lite lacks taped seams so it is not a 100% waterproof rain jacket. (112 grams in size medium.)
"The Ultra-Lite Rain Jacket is perfect for storing in your jersey pocket and ready to be pulled out during an unexpected shower. The main body of the jacket is a stretch fabric that is completely waterproof, and cloth panels under the arms allow some ventilation. The rear of the jacket sits lower than the front and protects your chamois from road spray—a blessing should you get caught in a sudden downpour. At 117 grams, it’s light enough that you’ll forget you’re carrying it—until you need it."