SMK8 Bulwark Men's Hi-Visibility Lightweight Long Sleeve T-Shirt This hi-vis shirt is flame resistant and features reflective striping for additional visibility. Flame-resistant 360 Degree visibility with front and back 2" segmented heat seal silver reflective striping Concealed chest pocket with pencil stall Full underarm gussets Rib knit cuffs Fabric Flame-resistant, 6.7 Ounce 48% Modacrylic, 37% Lyocell, 15% Aramid