This shirt has a small hole in the back bottom of the shirt. It is shown in pics. Soft and lightweight, the FR Work Crew T-Shirt helps keep you cool and comfortable while you work. Built-in flame-resistance and moisture-wicking technology make it an instant favorite for staying protected on hot jobs. Style No. 10012258 Safety CAT_rated_L CAT 2 Rating for dual-hazard flame resistant workwear to help protect against flash fire and electrical arcs arc 8.9 cal/cm2 Rated to protect from second degree burns when exposed to an electrical arc NFPA_70E NFPA 70E Meets NFPA 70E/ASTM F1506 performance requirements NFPA_2112 NFPA 2112 UL® classified to NFPA 2112