Some are better than others but they are pretty good in isolating higher frequency vibration which seems to be the annoying part at highway speeds.

Olympia gel gloves are better at it than Icons I have now unfortunately their quality went down since they moved production to china and they were not that durable 2 seasons was the most I could get out of them as they would disintegrate from sweat in hot climate. Still worth it especially if you catch them on sale.

Other option is grip puppies but IMHO they oversize grips too much to effectively control clutch standing YMMV.