Threshold Classic Percale 300 Thread Count Pillowcase Set (King, Xavier Navy) Thread Count: 300, Fiber Content: 100 % Cotton Retired Style from Threshold. Pillowcase Features: Double Turn Hems Weave Type: Percale Give your pillows some extra oomph with a Threshold Percale Pillowcase Set. Crisp and cool, these pillowcases are made of 100% cotton with a percale weave and a thread count of 300, making them soft and smooth. They're durable, breathable and comfortable, too. Plus, they're designed to get softer with repeated washings.The pillowcases come in modern prints and stylish colors that help keep your bed on trend. They mix and match easily with other bedding.