For Zegna, Oasi linen is one of the many ways the label is improving its traceability and sustainability, committing to certifying all its Oasi linen fibers as 100% traceable by 2024. Entirely European-grown, the refined, uber-soft fibers are used to create timeless styles like this overshirt, which is enhanced with a jersey membrane for added structure. Linen/Flax. Color: natural