ECO-BAMBOO: 66% RAYON FROM BAMBOO / 26% 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 fabric is Oeko-Tex Standard 100 certified.