https://www.amazon.com/dp/B01LDSPSPO/ref=cm_sw_r_cp_apa_i_H8qzFbS7W59A2

Thats what i use

Just do yourself a favor, unless you have no other option, dont use foam earplugs. They completely muffle all the high end and sound terrible. I would recommend these earplugs. It comes with two pairs. 15db and 25db reduction.

https://www.amazon.com/gp/aw/d/B00H2F87I8/ref=mp_s_a_1_1_a_it?ie=UTF8&qid=1516151064&sr=8-1&keywords=livemusic+hearsafe+ear+plugs&dpPl=1&dpID=31ANZ4PDRJL&ref=plSrch

I've also used these a lot.

https://www.amazon.com/gp/aw/d/B01LDSPSPO/ref=mp_s_a_1_1?ie=UTF8&qid=1516151318&sr=8-1-spons&pi=AC_SX236_SY340_FMwebp_QL65&keywords=eargasms+ear+plugs&psc=1

I’ve thought the same and measured SPL at the Dolby Cinema at the AMC Metreon 16 in San Francisco. I’ve made multiple complaints and am always told the theater is in spec. On average the trailers and movies have a peak level of 110 dBc with most dialogue around 80-90 dBc.

The loudest thing I’ve recorded is the Godzilla trailer which peaked at 117 dBc. I consider that dangerous.

After some research I recently bought Eargasms brand. 15NRR

Eargasm Smaller Ears Earplugs for... https://www.amazon.com/dp/B01LDSPSPO?ref=ppx_pop_mob_ap_share

Even a mild movie like Mary Poppins was uncomfortable at that volume since normal speaking volume is around 70 dB and remember the scale is logarithmic. Even a child singing a sweet falsetto @90dB sounds like someone screaming in your ear like Jim Carrey in Dumb and Dumber with “the most annoying sound in the world!”

If you want to measure your local theater I highly suggest “Decible X Pro” on the iOS App Store. There is also a free version which is pretty functional.

Decibel X PRO: dBA Noise Meter by SkyPaw Co. Ltd https://itunes.apple.com/us/app/decibel-x-pro-dba-noise-meter/id1257651611?mt=8

Decibel X: dB, dBA Noise Meter by SkyPaw Co. Ltd https://itunes.apple.com/us/app/decibel-x-db-dba-noise-meter/id448155923?mt=8