Bumgenius 4.0 diapers are made of high quality material and the elastic in the Bumgenius 4.0 diaper can easily be replaced which proves these pocket diapers are designed to last. The stretchy pull tabs are also a great feature that provide extra sizing flexibility. Whether you have a small, average or larger baby Bumgenius 4.0's should fit just right. Add a Bumgenius Diaper Doubler for heavy wetters or night time use to make these cloth diapers your ultimate defense against leaks.