Like wool, most nylon fibers (about $2-$7 per sq. ft.) are yarn-dyed (dyed after they've been tufted), which allows for intricate patterns and rich colors. They're typically coated with topical stain treatments. Some newer nylons are solution-dyed (infused with color and stain repellents prior to tufting), improving their fade and stain resistance, but they come in fewer hues. Bottom line: As versatile as wool and almost as durable, with a lower price tag.