Can sheets be both extremely durable and incredibly soft? The Supima® Cooling Cotton Sheet Set are. At the heart of the 600 thread count Supima fabric are extra-long, 100% American grown cotton fibers. Longer fibers give these sumptuous sheets their long life and a luxurious softness that gets even softer over time. And to make sure the fitted bottom sheet stays exactly where you want it, sturdy elastic edges prevent shifting and keep it in place. Plus, the unique Supima fibers retain their vibrant color and crisp, fresh feel, wash after wash. Your bed—and your sleep—deserve the beauty, resilience and supple feel of these Supima 600 TC cotton sheets.