95% Polyester, 5% Elastane Machine Wash Train in confidence with this performance muscle shirt made from breathable, moisture-wicking This ultra-soft, moisture-wicking knit fabric provides a versatile layer with a loose and light fit for maximum range of motion An athletic fit that sits close to the body for a wide range of motion, designed for optimal performance and all day comfort Sport made better; Ideal for working out, yoga, exercise, running, cross training etc.