Sara's Prints Boys 2 Piece Relaxed Fit Short Pajama Set 55% Cotton, 45% Acrylic Imported Machine Wash 55 percent cotton, 45 percent mod acrylic inherently flame resistant fabric Loose fitting, soft fabric allow for the utmost in comfort Contrast cotton/spandex rib-knit in neck band for shape memory Made with high quality fabric to endure plenty of pajama days of fun