Chrono Wind is our packable ripstop fabric with 2-way stretch and a DWR coating that's engineered to slice through the wind without weighing you down. Durable Water Repellent (DWR) is a finish or coating added to Giro fabrics to make them water resistant so they can shrug off rain, snow, and damp conditions. The pack sack is built right into the garment, for fast, easy storage when needed. Perforated panels allow warm air inside the garment to escape, enhancing thermal regulation, moisture management and overall comfort as you ride. A soft chin guard at the top of the zipper helps prevent chaffing and tender skin from getting caught, too. Adding some windproof protection on a ride can certainly make for a more pleasurable experience if the winds are howling and the temps are cooler and the Chrono Expert Wind Jacket from Giro is an excellent shell for just such an occasion. Its lightweight windproof material provides a barrier against chilly gusts while its durable, 2-way stretch ripstop fabric easily packs down to fit into a jersey pocket when it's not needed. As part of its Chrono lineup, it receives a form-fitting silhouette so it doesn't billow in the wind leading to wasted watts. Giro treats the jacket with a DWR coating to keep road spray and light precipitation on the outside from wetting out the jacket and chilling you. Likewise, a perforated back panel lets excessive body heat and sweat vapor escape and reduces the amount of moisture buildup inside. And for low light conditions, you'll appreciate the 3M reflective logos and details helping to enhance visibility to other road users.