ECO///Bamboo (Rayon from Bamboo): 66% Bamboo (Rayon from Bamboo) / 28% Cotton / 6% Spandex. A men's longsleeve crew made with moisture wicking, antimicrobial, stretchy, Eco///Bamboo featuring stretch silk accent flatlock stitching details along the raglan, down the side and in unique accent oval details and the elbow, across the forearm and under the arm. This item is in-stock in three colors, with a matching ladies' version. This fabric is Oeko-Tex Standard 100 certified. Sizes: Small to XXL.