The DRIFIRE PRIME is crafted from 6.5 oz. DRIFIRE® PRIME fabric, offering a supple, four-way stretch for superior mobility and comfort. Its offset flatlock seams and dropped shoulder design ensure a no-rub experience, while the lightweight FR fabric feels super-soft and fits like a second skin. Engineered for high-performance, the shirt features inherent flame resistance, moisture management, and odor control, drying up to three times faster than cotton. With UPF 50+ protection blocking 99.5% of UV radiation, it meets ASTM 1506 FR compliance standards, is Berry compliant, and proudly made in the USA. Designed for professionals, the Tan 499 is also Safe to Fly certified, offering unmatched comfort and protection in demanding environments.