Hanes Girls' X-Temp Printed Thermal Set Hearts XS Fiber Content: "60% Cotton, 40% Polyester" Soft, waffle knit thermal cotton-rich fabric. Tag-free for itch-free comfort. Sturdy seam construction for added strength and durability with smooth, flat no rub seams to prevent chafing. Preshrunk for lasting fit. Size up for a roomier fit.