I’ve been using Alpine ear plugs and while the plugs themselves work well, the cord attachment is a weak point. The clips don’t hold securely, so when you pull the cord to remove the plugs, the cord detaches and the plug stays stuck in your ear.
A better design would be a rubber cord with a loop that fits snugly into the middle of the plug. That way, if the plug gets stuck, you can pull the cord and the plug pops out easily. It’s a small change that could make a big difference in usability and comfort.