The short version
Mack’s silicone putty is the original moldable earplug — you shape a small ball over the outer ear canal rather than inserting it deep, which is the main reason it’s a common recommendation specifically for side sleepers. 4.5 stars across nearly 6,700 ratings.
What it actually is
Per the manufacturer’s listing:
- Moldable silicone putty — shapes to the unique contours of your ear rather than a fixed size
- Seals over the outer canal opening, not inserted deep — the key comfort difference from foam
- 22 dB NRR (US) / 30 dB SNR (EU) — lower than foam, but still meaningful reduction
- Reusable for weeks — reroll a fresh piece from the same putty ball each night
Who it’s a good fit for
Side sleepers specifically — because the seal happens at the outer ear rather than deep in the canal, pillow pressure doesn’t push it uncomfortably deeper the way it can with foam. Also a solid pick for anyone who wants a reusable option instead of nightly disposables.
Where it’s probably not the right pick
The noise reduction rating is meaningfully lower than foam (22dB vs. 33dB) — if you’re blocking loud snoring or significant ambient noise, Mack’s own foam earplugs block more. It also requires a bit of nightly prep (rolling and shaping the putty) that foam and loop-style don’t.
Bottom line
The clearest pick in this roundup for side sleepers specifically — the shallow-seal design solves the exact comfort problem that makes foam earplugs frustrating for side sleeping.
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Related reading
- Best Earplugs for Sleeping: Our Full Comparison
- Best Earplugs for Side Sleepers
- Best Earplugs for Sleeping: Foam vs Silicone vs Loop-Style
Disclosure: As an Amazon Associate, Fast Sleep Fix earns from qualifying purchases. This review is based on the manufacturer’s published specifications and Amazon’s aggregate rating and review-volume data — not first-hand testing by our team.
