I have shure e2cs. They require a good seal to get the best sound (any bass actually). They where good on planes. The tips are either memory foam or a soft ru

I have shure e2cs. They require a good seal to get the best sound (any bass actually). They where good on planes. The tips are either memory foam or a soft rubber. The foam ones worked better, but lamentably they don't seem to make replacement tips anymore...