Stay cool under pressure with the Outdoor Research Men's Vigor Grid Fleece Half Zip Pullover. This lightweight layer features a breathable waffle grid back that keeps you comfortable during high-intensity adventures, powered by ActiveTemp technology that adapts to your body's temperature. Built tough with flat-seam construction to prevent chafing, a convenient 12-inch center front zipper, zip chest pocket, and ergonomic design with thumb holes for unrestricted movement. Whether you're pushing hard on the trail or layering for unpredictable weather, this pullover moves with you. Fabric: bluesign® approved 94% Polyester 6% Spandex