This is achieved via a small vent at the centre of the ear plugs which allows the pressure built up in the ear to dissipate slowly over time

Soothers earplugs offer a high SLC80 30dB

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Guardian™ Earplug-Earbud Hybrid

Macks Snoozers™ Moldable Silicone Putty Ear Plugs (NRR 22 | 6 Pairs) Sleep This is achieved via aMack's Snoozers Silicone Putty Ear Plugs are made of hypo allergenic, soft, moldable, silicone putty. Just like other Mack's moldable silicone ear plugs, Snoozers mold easily, and comfortably to the unique contours of any ear. Once in place, Snoozers apply no pressure to the ear, and the "cover the canal only" design provides unsurpassed comfort for quality, restful sleep. Mack's Snoozers are highly recommended for snoring spouses, noisy neighbours,