BLACKHAWK! Men's Performance Cotton Tactical Short Sleeve Shirt cotton 88% Cotton, 12% polyester = (88% Cotton - shell 12% polyester - mesh) or, 100% Cotton with 100% polyester Mesh at armpits). Features expandable, angled, top-opening flap chest pockets with hook & loop, discreet pen slots at top of chest pocket flaps double as cord-routing holes for media player Lightweight cotton material with the main body constructed of wrinkle-, fade-, and stain-resistant 6.1 oz. 100% cotton canvas and the underarm constructed of mesh knit fabric Do Not Dry Clean, Machine Wash temp 30C, Non-Chlorine Bleach When Needed, Tumble Dry Normal Medium Heat, Iron Low Heat No Steam Indonesia