Cotton is not one fiber. Combed, ring-spun, open-end, zero-twist, Egyptian, Pima, Xinjiang, organic — each has a different weight, hand-feel, absorbency curve and cost profile. Same with microfiber, hemp blends and bamboo. This category sorts through the working spec language of fiber and material selection for custom towels: what each fiber actually does, when it earns its premium, and when to step down to a cheaper alternative without losing program quality.