Shure EAYLF1-100

If you've got the Shure in ears, these are the best ear sleeves. They mould to the shape your ears and I find them to be the best for isolation and comfort, compared to the other types of sleeves.

I'd definitely suggest buying these over the cheaper copies, as the copies can be made out of less material and usually don't fit the ear as well or feel as comfortable.

You'll get several uses out of them as well, if you regularly wash them with soapy water.

You 've got to replace them more often than the plastic type plugs, they are not 'cheap'... but they provide better isolation than others, in my opinion. They will also fit other in-ear brands (Ethymotic, per example). To me, they are still the best plugs available.