The latex in this egg crate topper is certified 100% natural latex Dunlop process produced. You've never felt anything like this! It is very important to get the cotton case for your latex egg crate topper. Latex is a natural product and needs the protective layer. Without it, biodegradation is accelerated. Latex has naturally occurring flaws which include small rips, small particles, patches, discoloration, and variant surface texture.