Definition
"Four-ply" describes something made up of four layers or strands, interwoven or laminated together. It's often used to describe yarn, paper, or fabric. This construction increases the strength, thickness, and durability of the material. Think of it as four pieces working together instead of one. Four-ply yarn is thicker than single-ply and creates a warmer fabric. Four-ply paper towels are more absorbent.