Hi Vis Hoop Taped Closed Front L/S SHIRT (Mens)170 gsm mid weight, 100% 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 Buttons run only half way down the shirt to provide greater protection Two chest pockets with button closures and pen partition Fade tested HI VIS DAY NIGHT VISIBILITY 4602. 1. 2011 High Visibility Safety Garment Construction Class D N 1906. 4 High Visibility Materials Class R F