Gear up for cold-weather operations with the GI USMC FROG Thermal Undershirt, part of the Fire-Resistant Organizational Gear (FROG) used by the U.S. Marine Corps. Engineered for harsh environments, this undershirt is designed to keep you warm down to 14°F while providing advanced fire-resistant protection.
 
Made from a blend of 78% Modacrylic and 22% FR Rayon silkweight fabric, this undershirt offers a balance of warmth, durability, and flexibility. Its moisture-wicking properties keep you dry during intense activity, making it ideal for both layering and standalone wear in colder temperatures.
 
As a Genuine US Military Issue item, this undershirt is built to the highest standards for performance and safety, with fire-resistant properties that meet the needs of military personnel. Proudly Made in the USA, it is both durable and comfortable for extended wear in challenging conditions.