Viewpoint look: the small tube protrudes a little on each ear. It is transparent, so relatively quiet in a dim environment. For DJs, it is possible to wear a helmet on top.
Warning: there are two sizes for these plugs. Below are the "wide" that are proposed (marked in white). It's best to buy first the "regulars" blue, which are suitable for most of the population. The "large" are a bit too big for me, and hurt a bit in time, when I sink to the bottom.
The caps come with a handy little box for storage and an optional cord to wear around the neck.