bumGenius One-Size Microfiber inserts are made of 3 layers of the thickest microfiber terry available anywhere. Our unique snap down design allows these inserts fit perfectly in a One Size, small, medium or large pocket diaper ! Our new, wider and longer design fills up pocket diapers side-to-side and end-to-end. No more leaks! Absorbency: Our inserts are now manufacturer rated at 15 oz. aborbency. Many other companies offer microfiber inserts now, but no other microfiber insert compares to the bumGenius microfiber insert. What is different? Our product is simply more absorbent than the others