PGI's DriGuardâ„¢ PRO FR t‑shirts provide the last layer of defense and the first layer of comfort. This inventive fabric brings ease‑of‑wear and flame resistance together in an incredibly lightweight base layer weighing only 4.5 osy (150 gsm). DriGuard base layers are the perfect compliment to multi-layer flame-resistant clothing systems. DriGuard t‑shirts are non‑contributory — meaning they won't ignite, melt, drip, or adhere to the skin, enhancing the combined protection of your FR outer layers. The fabric is extraordinarily soft and comfortable, yet offers better protection than conventional cotton base layer alternatives.