Nike Men's Dri-Fit 1/2 Zip Vest 90% polyester 10% spandex Dri-FIT Imported Dri-FIT fabric to wick sweat away and help keep you dry and comfortable. Half-zip vest silhouette with mock neck to block out the elements Stretch fabric for enhanced range of motion. Contrast rib at collar for style Lower body: 8.3 oz. 100% polyester Dri-FIT knit; Upper body: 5.6 oz. 90% polyester 10% spandex