ECO///Bamboo (Rayon from Bamboo): 66% Bamboo (Rayon from Bamboo) / 28% Cotton / 6% Spandex. Similar to the men's Longsleeve Flatlock Crew, with a flattering ladies fit. Both the men's and ladies' versions feature sturdy double needle construction at the neck, sleeve and hem openings. Flatlock construction is flat and seamless on the outside and inside, eliminating chafing for better comfort. This item is in-stock in three colors, with a matching men's version. This fabric is Oeko-Tex Standard 100 certified. Sizes: XS to XL.