This baby has two caps fly, a thinner and more flexible so as not to hurt the fragile little nostrils of infants and a second rigid and wider for larger babies. Ideal as a baby does not know whether nose, especially in case of cold (I do not use it every day). Aspiration enough to quickly clear the nostril (after injecting some saline to liquefy secretions) and baby feel better right away. A little impressed at first, it quickly makes it especially since the action is fast and painless. It can block the other nostril for more effective even if baby does not really appreciate ... Easy to clean (the container opens in two) and completely airtight, an essential in the baby kit.