If you opt for the convenience of disposable diapers over their more environmentally-friendly cloth alternatives, you probably don’t stop to think about the science that allows them to keep your baby dry at night. But engineerguy Bill Hammack has, and in a new video, he explains why you’re actually wrapping your baby’s butt in a brilliant piece of engineering.

Elastic walls designed to contain your child’s bowel movements are certainly part of the innovation at play, but the real genius comes with a set of three layers that whisk liquids away, prevent them from re-surfacing and touching your baby’s skin, and then storing them for up to 12 hours overnight.

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If you’ve got a little one in diapers, take a minute to appreciate those disposable diapers you rely on, because the next time you go to change them you’ll probably be concentrating on cleanup instead.

[YouTube]