THC Factor is the apparel arm of GreenRX™ Corporation — a Wisconsin-rooted cannabis lifestyle company headquartered in Madison. We’re home to the American Cannabis Society®, founded in Madison, WI in 1978. We design and print original weed shirts, hoodies, hats, and cannabis-themed apparel under our family of brands — TYFPS®, Free Joint Friday™, Blazed Frog™, and BillyMart™. Every piece is created and shipped from Wisconsin to fans across the United States.