Every purchase you make is important. What you put on your skin is important. You don't want nasty chemicals and strong dyes next to your body, do you? Organic clothing is made to Global Organic Textile Standards, using only approved methods.
Natural fibers are kind to your skin as they allow ventilation (unlike the nylon and polyester) and don't dependent on oil for its source. Newer fiber, like the bamboo Polo on a picture not only wick moisture very well but also have anti-bacterial properties, so there is less odor. Soft and so comfortable!