Arbor Men's Brooklyn Long-Sleeve Shirt 60% Viscose derived from Bamboo/40% polyester Made in US Machine wash 60% Viscose derived from Bamboo/40% polyester raglan henley shirt custom made in los angeles, canada Super soft hand Custom arbor button and metal flag Raglan cut Check out the many benefits of using Rayon derived from Bamboo http://www.arborcollective.com/2009/07