The founders of Loop earplugs suffered hearing damage from years of attending loud concerts and wanted to help others avoid the same fate.Now their cult earplug company brings in $220 million, has collaborations with Coachella and McLaren, and has just come to a big box retailer.Learn more about how Loop turned down the volume for Gen Z and dialed up massive revenue: https://t.co/Wu6tRjJYN4 ...