Durable nylon/spandex fabric is breathable and treated with a durable water repellent (DWR) to shed light rain and stains Back vent helps you keep cool Elastic waist has an enclosed belt so you can dial in the fit Drop-in hand pockets with hidden, zippered security pocket inside right pocket Fabric offers UPF 50 sun protection Shoulder seams are rolled forward to avoid chafing under pack straps. Made to reflect our love for people and the planet through the use of bluesign®-approved materials bluesign®-approved materials conserve resources and protect the health of the environment, workers and wearer (you!)