MONSTER JAM X30i EarplugsFlip the switch. Feel the roar. Stay safe. The MONSTER JAM X30i Earplugs use a simple toggle valve so you can switch between full protection or hear through mode in seconds. Open mode lets you hear the crowd and announcer. Closed mode blocks out the thunder when trucks hit full throttle. Built to handle both nonstop noise and sudden BOOM sounds, these earplugs keep ears protected through every jump, crash, and engine blast. Just flip the switch while