I purchased a Pima cotton t-shirt and a bamboo shirt, after buying a World Wildlife Fund (WWF) t-shirt that had an animal on it. The WWF shirt was SO comfortable that I tracked down the maker of the t-shirt: ONNO. I found their website and had to choose the material for a t-shirt. I went with Pima because it is so soft and I was able to determine the WWF shirt was bamboo. So, I purchased a bamboo shirt as well. These shirts are VERY, VERY comfortable! They retain their size and shape after washing as well. Thirty-eight dollars is a lot to ask for a t-shirt but these are honestly a cut above your typical comfortable t-shirt. I will buy more bamboo t-shirts soon.