What is 耳栓（気圧変動対応）?
Meet the earplug that actually understands altitude anxiety. Daiso's 耳栓（気圧変動対応） — literally "Pressure Change Earplugs" — is a ¥110 silicone-and-ceramic earplug engineered to reduce that familiar ear-squeezing discomfort you feel on planes, bullet-train tunnels, and mountain drives. At just 3cm × 1cm × 4cm, it slips into any pocket or pouch without a second thought.
What separates this from a basic foam plug is the internal special filter combined with a circumferential ring design. That ceramic-loaded filter doesn't just muffle sound — it regulates the air pressure reaching your eardrum, smoothing out those sudden pressure spikes mid-ascent or inside a Shinkansen tunnel. Materials are silicone resin + ceramic + polypropylene: soft enough to wear comfortably for hours, rigid enough to hold its shape. One pair is included per package, and yes — a compact carry case comes in the box, so you're not fishing for a tiny earplug at the bottom of your carry-on ever again.
The slim, slightly elongated form fits snugly into the ear canal. It sits a little proud of the ear (more on that in the caveats), but the circular ring ensures a consistent seal across most ear sizes. Build quality feels noticeably more considered than a disposable foam plug — this is clearly designed to be reused trip after trip. For a product priced under the cost of airport vending-machine water, the spec list is genuinely impressive.
Source: daisonet.com
How to Use It — Hack Ideas
Primary use — travel comfort: Pop these in before takeoff, before the Shinkansen dips into a tunnel, or before a steep mountain road descent. The filter works passively — no activation needed. Just insert, let the ring seal the canal, and let the ceramic filter do its job equalizing pressure. Perfect to keep in your travel pouch alongside your boarding pass.
Hack #1 — Elevator sensitivity relief: Live or work in a tall building with fast elevators? Skyscraper lifts can cause the same subtle pressure pop as a plane. Keep the carry case in your work bag and use these whenever the express elevator leaves your ears ringing. It's one of those micro-discomforts most people just tolerate — until they don't have to.
Hack #2 — Concert / loud event edge-case use: The pressure filter also moderates sudden sound pressure spikes, making these a surprisingly decent low-fi hearing protector at loud events (think fireworks, live music in a small venue). They won't replace professional musician earplugs, but in a pinch — or when you've forgotten your usual pair — they keep the experience comfortable without completely killing the sound. The "mild quiet" effect reviewers note actually becomes an asset here.
Reviews & Verdict
User sentiment is warm, with a clear consensus: "This price for pressure-adjustment technology?!" is the most common reaction. Editor testers noted a pleasantly soft fit that stays comfortable over extended wear and doesn't trigger ear soreness — a genuine win versus stiffer alternatives.
That said, reviewers are honest about the caveats. The elongated form protrudes slightly from the ear canal, making side-sleepers uncomfortable — this is not a bedtime plug. It's also one-size-fits-all, so users with smaller or unusually shaped ear canals may find the fit less secure. And while the pressure-relief function is real, its effectiveness is inherently personal: people who are highly sensitive to pressure changes report clear relief; others may notice only modest difference.
Sound attenuation is described as "just right" rather than total silence — ambient noise softens, but voices and alarms remain audible. For most travel scenarios, that's actually ideal. The included carry case is consistently praised as a practical bonus that prevents loss and keeps the earplugs hygienic between trips.
Bottom line: A smart, reusable travel companion that punches well above its price point. Not a cure-all for every ear shape or sensitivity level, but for frequent flyers and train commuters, it's a no-brainer addition to your travel kit.
Value Score: 82/100
A specialized pressure-equalizing filter, ceramic construction, and a carry case — all for ¥110 — delivers exceptional price-to-quality value. A nudge below the top tier only because the one-size fit and side-sleep incompatibility limit its universal appeal. Great value, worth every yen.
