100% Cotton Twill - 170 gsm|170 gsm mid-weight cotton twill to keep you cool while still being tough enough for any job |Underarm and upper back mesh vent inserts to keep you cool in any environment |Triple stitched seams|3M 8910 reflective tape in H configuration |Two chest pockets with button closures and pen partition |Extended curve shirt back|Sizes S - 5XL, 7XL - Syzmik