I use earplugs to sleep, as I'm so sensitive to noise. I don't like the kind of earplugs which block out ALL noise as I still want to be able to hear alarms,etc. I normally buy foam ones, but they use up quickly and are a bit expensive (and vary from brand to brand so dramatically you really never know what you are going to get.) Since the stores do not always have all the products available these days, I thought I would try these reusable ear plugs. They are great! Due to the design, you can push them in to different levels-- all the way in I think would stop all sound and keep water out. But you can also push them only halfway in and they stay in place, and are not uncomfortable for sleeping. I really like the fact that they are reusable and washable.