I like these:
Not specifically ear plugs, but they are definitely isolating. I’ve tried a few different types of plugs including those that supposed to filter/cut down on the noise while still allowing you to hear your music and did not care for them.
These are great for isolating road/wind noise and they sound great for music. Sits flush in your ear and fits under a helmet without issue.
As a side benefit, if/when the Sena ambient mode chooses to work you can communicate with the outside world a bit better by hearing your surroundings through the earbuds. But, that feature rarely seems to work in practice.