Re-introducing the pinnacle of shirt engineering. We've revamped the super-versatile Secret Wash shirt with premium 100 percent organic cotton 100s two-ply yarns, plus an improved fit. "100s" refers to a finer yarn size, and "two-ply" means two yarns are twisted together to make a single thread. The result is smoother, stronger fabric. We also use our (proprietary) multistep wash process to achieve a soft, broken-in feel from day one. Organic cotton is grown without toxic chemicals or GMOs (genetically modified organisms), which means it's better for the health of the soil, the ecosystem and the people who farm it. Long story short: The customer favorite since 2005 is now better than ever.