Denim is one of the most iconic textiles in the world, widely recognized for its durability, versatility, and cultural significance. Many people assume that denim is always made from 100% cotton, but the truth is more complex. While traditional denim fabric was historically woven entirely from cotton yarns, today’s textile industry offers a wide variety of denim fabric material blends that incorporate elastane, polyester, or other fibers. These modifications improve comfort, stretch, and performance, making denim suitable for diverse applications beyond jeans. In this article, we will explore the composition of denim, compare denim fabric types, examine industry data, and highlight modern trends shaping this timeless fabric.