Our lightweight FLEXSAFE™ fabric is (FR), and inherently comfortable. It is a 4-way stretch fabric and constructed with flat lock seams for maximum comfort, whether you wear it as a base layer or an everyday t-shirt. It wicks moisture away from the skin, keeping you cool, dry, and fresh all day long. It is the softest and most comfortable FR base layer t-shirt we’ve ever made. Guaranteed comfort and quality.