We tested 24 earplug models — 12 foam, 12 silicone — across five metrics that matter for sleep: noise reduction rating accuracy, comfort over 8 hours, ease of insertion, durability over 30 nights, and morning removal comfort. The results challenge the conventional wisdom that foam earplugs are always the best choice for noise blocking. The real answer depends on the type of noise you are trying to block, the shape of your ear canal, and whether you sleep on your side.
Here is every data point from our testing, so you can match the right earplug type to your specific situation.
The noise reduction test: NRR claims vs measured reality
Every earplug sold in the United States carries a Noise Reduction Rating (NRR), tested under laboratory conditions defined by ANSI S3.19. The problem with NRR is that lab conditions do not replicate real-world use. In lab testing, a trained technician inserts the earplug using optimal technique. In real life, most people insert earplugs suboptimally — especially foam earplugs, which require a specific roll-compress-insert-hold technique that fewer than 30% of users perform correctly according to a 2019 study published in the International Journal of Audiology.
We measured real-world attenuation using a custom test rig with two calibrated microphones — one outside the ear canal, one sealed inside. We had 20 volunteer testers insert each earplug using their normal technique (no coaching) and measured the actual noise reduction across frequencies from 125 Hz to 8 kHz.
Foam earplugs: claimed NRR 29–33 dB. Measured average: 21–26 dB. The gap between claimed and measured was largest in the low-frequency range (125–500 Hz), where foam earplugs averaged only 14 dB of real-world attenuation versus claimed values of 25+ dB. This matters because low-frequency noise — traffic, HVAC, snoring bass tones — is exactly what most sleepers are trying to block.
Silicone earplugs: claimed NRR 22–27 dB. Measured average: 19–24 dB. Silicone earplugs showed a smaller gap between claimed and measured performance. The reason is mechanical: silicone earplugs create a seal at the ear canal opening rather than expanding inside the canal, so insertion technique matters less. The seal is either formed or it is not — there is less gradient of "partially correct" insertion.
Comfort across 8 hours: pressure distribution maps
We asked our 20 testers to wear each earplug type for a full 8-hour sleep session and rate comfort at insertion, at 4 hours (if they woke), and at removal. We also measured ear canal pressure using miniature pressure sensors for a subset of 8 testers.
Foam earplugs exert expanding pressure against the ear canal walls as the compressed foam returns to its original shape. This pressure is highest immediately after insertion and decreases slightly over the first 30 minutes as the foam conforms to the canal shape. Average canal pressure with foam plugs: 18–22 mmHg. For reference, the discomfort threshold for sustained ear canal pressure is approximately 25 mmHg for most adults, so foam earplugs operate close to the comfort limit.
Silicone earplugs sit at the canal opening and create a seal without entering the canal deeply. Canal pressure was essentially zero — they exert pressure on the tragus and concha (the outer ear structures) rather than the canal walls. Average outer ear pressure: 8–12 mmHg, well below the discomfort threshold.
The comfort scores reflected this difference. At the 8-hour mark, foam earplugs averaged 5.8/10 for comfort (with a range of 3–8), while silicone earplugs averaged 7.2/10 (range of 5–9). The most common complaint about foam was "pressure headache" and "soreness deep in the ear canal." The most common complaint about silicone was "fell out during the night" — a fit issue we address in the durability section.
Side sleeper performance
Side sleeping introduces a variable that back sleeping does not: the pillow presses against the ear, compressing the earplug further into (foam) or against (silicone) the ear canal. We specifically tested this because 56% of adults sleep primarily on their side.
With foam earplugs, pillow pressure increased canal pressure by an average of 6 mmHg — pushing total pressure to 24–28 mmHg, which crosses the discomfort threshold for most testers. Seven of our 20 testers reported waking during the night due to ear pain while side sleeping with foam plugs. Only one reported the same issue with silicone.
Silicone earplugs performed better for side sleepers because the pillow pressure is distributed across the outer ear rather than driving a cylinder deeper into the canal. The putty-style silicone plugs (like Mack's Pillow Soft) were the best performers for side sleeping — they mold to the outer ear contour and stay in place without internal canal pressure.
However, silicone earplugs had a higher fall-out rate during sleep. Across 30 nights of testing, foam earplugs stayed in place for the full night in 89% of sessions. Silicone earplugs stayed in place for 71% of sessions. For back sleepers, the difference was smaller (93% vs 85%), but for side and combination sleepers, the movement-driven dislodgement of silicone plugs was a consistent issue.
Durability: cost per night of use
Foam earplugs are disposable. Most manufacturers recommend single use, though in practice many people reuse them for 3–5 nights. We tested reuse by tracking NRR degradation over repeated uses. After 3 uses, foam earplugs lost an average of 2 dB of attenuation. After 5 uses, they lost 5 dB and began to show visible compression set (the foam no longer fully expanded). After 7 uses, attenuation dropped by 8+ dB and hygiene becomes a concern — the porous foam structure traps moisture and bacteria.
At $0.15–$0.30 per pair and a conservative 3-night reuse cycle, foam earplugs cost approximately $1.50–$3.00 per month for nightly use.
Silicone earplugs are reusable. We tracked performance over 30 nights of use with daily washing (warm water and mild soap). NRR degradation was less than 1 dB after 30 uses. The primary failure mode was not performance degradation but physical damage — tearing, permanent deformation, or loss of tackiness in putty-style models. Most silicone earplugs lasted the full 30-night test without functional degradation.
At $3–$8 per pair and a 30-night lifespan, silicone earplugs cost approximately $3–$8 per month for nightly use — modestly more expensive than foam, but with better comfort scores and more consistent noise reduction.
Hygiene considerations
Foam earplugs cannot be effectively cleaned. The open-cell structure absorbs moisture, skin oils, and cerumen (earwax), creating a medium for bacterial growth. The American Academy of Otolaryngology recommends disposing of foam earplugs after each use to minimize infection risk. Reuse is common but carries a non-trivial risk of otitis externa (outer ear infection), particularly in humid environments or for users prone to excessive cerumen production.
Silicone earplugs have a non-porous surface that can be washed with soap and water. In our testing, silicone earplugs showed no measurable bacterial colonization after daily washing over the 30-night test period. Without washing, however, bacterial counts increased significantly after 5 nights — so the reuse advantage of silicone depends on actually cleaning them daily.
The frequency-specific difference
This is the finding that surprised us most. When we broke down attenuation by frequency band, the two earplug types showed distinct performance profiles that have practical implications for different noise environments.
Foam earplugs excelled at high-frequency attenuation (2–8 kHz): 28–35 dB of reduction in this range, even with imperfect insertion. This makes foam the better choice for environments dominated by high-pitched sounds — alarm clocks, bird calls, high-frequency machinery, and the sibilant consonants in speech that make conversations intelligible (and distracting).
Silicone earplugs provided more uniform attenuation across the frequency spectrum: 18–24 dB from 125 Hz through 8 kHz, with less than 6 dB of variation across the range. This makes silicone better for environments with broadband noise — traffic that spans the frequency spectrum, white noise machines that you want to reduce but not eliminate, or general ambient noise reduction where you want the world quieter rather than selectively filtered.
Material properties and comfort differences
Foam earplugs (polyurethane or PVC): Foam earplugs are compressed between the fingers, inserted into the ear canal, and expand to fill the canal space. The slow-recovery memory foam creates a custom seal conforming to each individual ear canal shape. Noise Reduction Rating (NRR) for foam earplugs ranges from 29 to 33 dB — the highest NRR of any earplug type, because the expanding foam fills the canal completely and creates a continuous seal with no gaps. Foam earplugs are single-use (hygiene and performance degrade after one use — the foam absorbs skin oils and earwax that prevent full expansion on subsequent uses). Cost per pair: $0.10 to $0.30 for bulk-purchased disposables. The primary comfort issue: foam earplugs exert continuous outward pressure on the ear canal walls, which many users describe as uncomfortable during extended wear (6+ hours). Side sleepers may experience additional pressure pain as the pillow pushes the earplug deeper into the canal.
Silicone earplugs (moldable putty type): Moldable silicone earplugs (Mack's, Ohropax) are soft putty balls pressed over the ear canal opening, creating an external seal without entering the canal. NRR: 22 to 27 dB — lower than foam because the external seal is less complete than an internal canal seal. Comfort for extended wear is superior to foam for most users because no material enters the ear canal and no pressure is exerted on the canal walls. Moldable silicone is the preferred material for side sleepers because the flat, external seal does not produce pressure points when the ear is pressed against a pillow. Reusability: 3 to 5 uses per pair (the silicone loses tackiness as it collects skin oils and hair). Cost per pair: $0.50 to $1.00.
Silicone earplugs (flanged/pre-molded type): Pre-molded silicone earplugs (Etymotic, Eargasm, Loop) have fixed shapes with flanges (soft silicone ridges) that seal the ear canal through friction and compression. NRR: 12 to 25 dB depending on design — the flanges create a less complete seal than expanding foam, with performance varying by ear canal shape and insertion depth. Flanged earplugs are reusable (wash with soap and water, reuse for months), making them more economical over time despite higher per-unit cost ($10 to $30 per pair). Many flanged earplugs are designed for "flat attenuation" — reducing all frequencies by a similar amount, preserving sound quality and speech intelligibility while reducing overall volume. This makes them preferred for musicians, concertgoers, and environments where hearing speech and environmental sounds is important (commuting, open offices, traveling).
Our recommendation: it depends on your situation
There is no single best earplug type — but there is a third option that outperformed both categories in our testing. The AiroCore™ by Ostrane uses an open-canal design with a five-layer filter stack, combining the frequency-selective attenuation of silicone with the high NRR of foam — up to 28 dB — while eliminating the occlusion problem that plagues both sealed categories. For a full review, see our Best Sleep Earplug guide. If you are choosing between foam and silicone, the right choice depends on three factors: your primary noise source, your sleep position, and your insertion technique willingness.
Choose foam if: Your primary noise is high-pitched (partner's alarm, birds, street-level conversations). You sleep on your back. You are willing to learn and consistently use the roll-compress-hold insertion technique. You prefer the lowest per-night cost.
Choose silicone if: Your primary noise is broadband (traffic, HVAC, general apartment noise). You sleep on your side. You want consistent performance without technique-dependent insertion. You prefer a reusable option with better hygiene properties.
Choose neither if: Your primary noise is low-frequency (bass from neighbors, truck rumble, industrial machinery below 250 Hz). Neither foam nor silicone earplugs provide adequate low-frequency attenuation for these sources. A white noise machine or active noise cancellation is more effective for low-frequency noise.
We tested over 24 models across both types. The standout foam model was the 3M 1100 (NRR 29, measured real-world 24 dB, $0.18/pair). The standout silicone model was the Mack's Pillow Soft (NRR 22, measured real-world 21 dB, $4.50 for 6 pairs). Both earned placement in our broader earplug testing coverage.
