100% cotton. Crew neck, long sleeves, straight hem. Ribbed neck, cuffs, and hem. Color name is Khaki; it looks olive green to me. Size M. 20.5 across chest (41” around), 25” length, 25.5” sleeve length. Purchased at Marks and Spencer store in York England. (We had to stay in the UK for 3 months while settling my in-laws estate and had to buy some warm clothes at M&S that we no longer need.) Very clean, only worn a few times, from non-smoking home.