Montbell's ZEO-LINE 3D fabric represents a leap forward in quick-dry fabric technology. The layer of fabric closest to your skin uses antibacterial, conjugated fibers of wool-like polyester, while the outside layer is made from anti-pilling, spun polyester made with bulky threads. Together, the two layers sandwich a third, middle layer of trapped air where moisture absorbed from your skin can spread out and evaporate more quickly. The result is exceptional moisture absorbency and control. ZEO-LINE 3D keeps you comfortably dry when you exercise and keeps you from getting chilled when you stop.