Our certified Pima cotton is extra-long staple cotton, known for its long, smooth fibers. It is woven into a high quality fabric that is soft and durable. With a thread count of 400 per square inch, we have also created a sheet that is breathable. The threads are not overly compacted, as with extra high thread count sheets, thereby allowing the air to flow through the sheet and keep you cool. Material: Certified Pima Cotton Classic hem stitch finish on flat sheets