I'm an ENT surgeon. My daughter has lost six pairs of swimming ear plugs since June
She started swimming at school this term. I bought her proper moulded plugs, then silicone ones, then the cheap ones in packs of three, on the theory that cost was not the problem. Six pairs. One was found in the washing machine. One is apparently 'with a friend'. The rest have simply left. She now swims without them and says her ears are fine, which, professionally speaking, is mostly true.