Filled with highest quality of shredded memory foam. You will experience the perfect balance between soft and support. This skin friendly soft case is made of super breathable pure cotton fabric. It absolutelly provides comfortable and ultra softness. These pillow inserts are shipped in a vacuum sealed plastic bag. Please let them recover for a few hours. Size is measured from seam to seam. It may looks smaller after fully fluffy. It's better to order 2 sizes up. 13 months warranty. Please feel free to contact us, we will make every effort to solve your problem.