I'm a fan of the Mack's purple rubber ear plugs. They don't have the strings like Doc's but I have only dropped them (but not lost) out of the water. I have a pair of Doc's but they are a little difficult to put on and take off. I feel like water still gets in with the Doc's in my ears but the Mack's keep everything out pretty well. They're a bit snug though but you get used to it.