Reposhing this item I purchased. It was listed as Large, but it definitely fits like a Medium. I tried it on once but never actually wore it! The Tuvalu Tee is an ultrasoft pima cotton t-shirt crafted with our natural SeaCell fiber (seaweed and wood pulp) for comfort, performance and a nod to Mother Earth. Great for yoga (non-heated), training, traveling and chilling. 96% Pima Cotton With Sea Cell, 4% Elastane