Arc'teryx Women's Skeena Zip Neck L/S Crystalis fabric that has good stretch and moisture wicking is used in main body; harder wearing yet soft Helius fabric used on shoulders and arms (hybrid mapping) Athletic fit ensures every day, all day comfort Strategically placed seams for use with a backpack Mid height collar and 1/4 zip neck with semi auto-locking zipper slider aids in temperature regulation Provides sun protection (UPF+50)