The amount of noise reduction you need for a concert depends on the loudness of the concert and length of time you will spend there. Every concert is different, but the average sound level at a large rock concert is about 100 decibels; some indoor shows can climb to 120 dB and beyond. Protection comes down to simple math: Sounds above 85 dB can damage your hearing after eight hours, while sounds at 100 dB can cause damage after just 15 minutes. If you’re at an all-day festival, look for earplugs that attenuate sound 20–25 dB. If your exposure is shorter, you can get away with less attenuation. If you love getting down front in the action, go for more attenuation.