DRIFIRE Flame Resistant Ultra Lightweight Short Sleeve Tee Fabric DF4-505TS 4.5 oz. ultra-lightweight soft fabric that prevents chafing Patented drirelease advanced wicking technology Dropped seams for no-rub comfort with ribbed collar to maintain shape Made in the USA DRIFIRE wicking garments will not melt or drip when exposed to flame, meaning it will not fuse to your skin or cause injuries that are far more severe than burns. DRIFIRE garments will not ignite or continue to burn once the source of flame is removed, a problem that can lead to increasingly serious burns with other types of garments. The flame resistant fiber used in DRIFIRE garments is self-extinguishing, ensuring that your exposure to flame or fire is minimized once youre out of the danger zone. The wicking technology allows garments to dry four times faster than cotton and help regulate skin temperature. DRIFIRE technology also provides odor protection so your garments wont smell, even after multiple wears.