Supima cotton is a superior type of cotton grown in the US. It represents less than 1% of cotton grown in the world. From the Supima Association:
"Not all cottons are equal. Supima and regular cotton are in fact two different and distinct species of cotton. The most common type of cotton grown around the world typically has a fiber length of only about 1 inch, whereas Supima cotton’s fiber averages 1.5 inches. While shorter fibers produce yarns that are rougher and subject to pilling on the surface of the product, longer fibers contribute to the strength and softness of apparel and home products, ensuring that they are more comfortable, retain color longer and resist pilling over time."
A short video on the production of Supima cotton: 


We use Supima cotton in all of our t-shirts. Explore the T-Shirt Collection here.