Our FR Classic Cotton™ Shirts are super comfortable and made to feel like your favorite weekend tee shirt. However, they provide the extra thermal protection you need to get home safely at the end of a work day. The shirts are made from 6.25 oz. 100% FR Cotton. The flame resistant tee shirts provide HRC 2 protection with an arc rating of 12 cal/cm². FR shirts include a reinforced left front chest pocket, rib knit cuffs, and generous cut for a non-restricting, optimal range of motion.