5-ounce, 88/12 recycled poly/recycled spandex with stay-cool wicking technology; White is 5.3-ounce for increased coverage Carbon footprint neutralized through Carbonfree® certification UPF rating of 50 OGIO heat transfer label for tag-free comfort Flat knit collar Recycled, embossed OGIO neck tape includes 80% recycled content 2-button placket Dyed-to-match, matte-finish buttons include 20% recycled content Forward shoulders Embroidered dyed-to-match O crafted with recycled thread at left sleeve Side vents