Thread count refers to the number of threads that make up one square inch of fabric. Typically, the finer the threads that can be woven together, the softer the fabric. Thread counts can range from 150 to 1,000. More crisp and clean than silky soft, bedding with a thread count of 150-399 are appreciated for their breathability and durability. Bedding made of 100% cotton - like this percale sheet set - are soft to the touch and durable. Unlike polyester bedding, cotton fibers wick away moisture, making 100% cotton sheets extremely breathable. With a percale weave, the threads go over and under in two perpendicular directions, creating a tighter weave that offers exceptional strength and long-lasting good looks. The overall result: a lightweight bed sheet with a cool and crisp feel that is perfect for the warmer months.