The fiber is what your sheets are actually made of, and it drives softness, temperature control, and durability far more than thread count alone. Supima cotton offers exceptional softness and strength. Egyptian cotton is prized for its long fibers and luxurious drape. Organic cotton is grown without synthetic chemicals, ideal for sensitive skin. Bamboo is naturally cooling, moisture-wicking, and great for hot sleepers. Choose based on how you sleep, not just how it sounds.