High-quality hearing protection
After a few months' daily use on a motorcycle, I can say it significantly reduces but does not eliminate road sound at highway speed.  I still hear a decent amount of road noise at speed, but it's nothing compared to what it would be without these earplugs.  After 3 months' daily use, the center of one of the earplugs is beginning to slip inside itself, requiring 2-3 adjustments per week, but is still effective.
Rating: 4 stars