Moldable silicone earplugs are the single most effective off-the-shelf method for keeping water out of your ears while swimming, outperforming foam, flanged, and wax-based options in head-to-head testing. But no earplug is perfect, and the type of swimming you do, the water you swim in, and whether you have any ear conditions all change the approach you should take. The good news is that a combination of the right plug, good technique, and proper drying afterward handles the problem for most people.
Why Water Gets Stuck in the First Place
Your ear canal is a narrow, slightly curved tube roughly two and a half centimeters long. Its shape means water can flow in easily but may not flow back out on its own, especially if the canal has a sharp bend, if earwax partially blocks the exit, or if surface tension creates a seal against the eardrum. Tilting your head to one side after a swim sometimes breaks that seal, but not always. The real issue is not just the annoyance of muffled hearing. When moisture sits in the canal, bacteria that entered with the water find a warm, damp environment where they can multiply and invade the canal lining, producing the painful infection known as swimmer’s ear.
How Different Earplugs Compare
Not all earplugs keep water out equally well, and the difference between the best and worst options is dramatic. A study that tested several commercial earplug types during actual swimming found that soft moldable silicone plugs had the lowest rate of water getting past them across surface swimming, horizontal submersion, and vertical submersion. Flanged and foam styles let significantly more water through under the same conditions.
Those results held whether the swimmer was doing laps on the surface or submerging fully. The soft silicone type outperformed all other plugs during every test protocol, with the gap widening during deeper submersion.
Here is a rough hierarchy of what works, based on available research:
- Moldable silicone putty: Conforms to the outer ear canal and creates a tight seal. Performed best in swimming trials and is widely available at pharmacies.
- Custom-molded plugs: Made from an impression of your ear by an audiologist. Excellent fit, but more expensive and not necessarily superior to well-fitted silicone putty for casual swimming.
- Foam plugs: Designed mainly for noise reduction. They compress to fit the canal but are not waterproof by design. Foam absorbs water over time, so they work poorly for prolonged exposure.
- Flanged rubber plugs: The “Christmas tree” shape common in drugstores. These create less reliable seals because they depend on the plug matching your canal diameter exactly.
One thing to keep in mind is that earplug performance drops as submersion depth and duration increase. Surface swimming is the gentlest test; vertical submersion (think diving feet-first or treading water with your head going under) pushes water harder against any seal. If you plan on diving or doing a lot of underwater swimming, even the best plugs have their limits.
The Cotton Wool and Petroleum Jelly Debate
For decades, doctors and parents have relied on a homemade fix: a small ball of cotton wool smeared with petroleum jelly and tucked into the ear canal. One study ranked this combination as the most effective at blocking water and also found it the easiest to insert and most comfortable. But a later simulation study that tested how materials held up over longer water exposure found the opposite result. Cotton wool with petroleum jelly had the fastest onset of leaking and the highest total water loss over time, while silicone putty and custom-mold plugs showed no leaks at all during prolonged exposure.
The likely explanation is that the cotton-and-jelly method works well for brief, shallow contact with water, like bathing or surface splashing. Over time, though, the petroleum jelly barrier degrades and water saturates the cotton. If you are doing a quick bath or a short surface swim, it can work fine, especially for young children who resist putting earplugs in. For anything involving repeated submersion or sessions lasting more than a few minutes, a silicone-based plug is the safer bet.
No Plug Survives Everything
If you are hoping to find one earplug that guarantees a dry ear canal regardless of what you do in the water, the research offers a sobering finding. A study that evaluated multiple plug types, including custom-molded solid-core plugs, found that none of them prevented water from getting through under conditions that approximated even shallow surface dives. The pressure changes during a dive, even a gentle one, can force water past a seal that holds perfectly during calm swimming.
This matters most for competitive swimmers who do racing dives, divers, and anyone who regularly goes underwater head-first. In those cases, earplugs reduce water entry but do not eliminate it. Pairing plugs with a neoprene swim headband (sometimes called an “ear band”) adds a second layer of protection. These bands cover both ears and hold plugs in place, reducing the chance of them shifting or popping out during a dive.
Drying Your Ears After You Get Out
Prevention does not end when you leave the pool. Whatever water does get past your defenses needs to come out before bacteria have time to set up shop. A few practical steps help:
- Tilt and shake: Tilt your head so the affected ear faces the ground, and pull gently on the earlobe to straighten the canal. A few gentle hops sometimes help gravity do its work.
- Air dry or towel the outer ear: Pat the outer ear dry with a towel. Do not push the towel or a finger deep into the canal.
- A few drops of drying solution: Over-the-counter swimmer’s ear drops, typically a mix of isopropyl alcohol and acetic acid, help evaporate residual moisture and restore the canal’s slightly acidic pH. You can make a similar solution at home with equal parts white vinegar and rubbing alcohol. A couple of drops in each ear after swimming is a common preventive measure.
- Avoid cotton swabs: Pushing a cotton swab into your ear canal can strip away protective wax, scratch the canal lining, and compact debris deeper, all of which increase infection risk. The ear has a self-cleansing mechanism that moves debris outward on its own.
Where You Swim Changes the Risk
The type of water you swim in matters as much as whether you wear earplugs. A study looking at swimmer’s ear risk across different water sources found a strong link between swimming in freshwater recreational lakes and developing an ear infection, particularly lakes containing the bacterium Pseudomonas aeruginosa. Swimming in chlorinated pools, rivers, or the sea did not show the same significant association.
Chlorinated pool water is not sterile, but the chlorine suppresses bacterial growth enough that infection rates tend to be lower. Ocean water, despite being teeming with microbes, has a salt concentration that discourages many of the bacteria responsible for ear infections. Lake water, especially warm and stagnant lake water, sits in a sweet spot for Pseudomonas growth. If you are a lake swimmer, the case for earplugs and post-swim drying is stronger than it is for someone who only swims in a well-maintained pool.
Open-Water Swimming and Dizziness
Keeping water out of your ears is not just about preventing infections. For open-water swimmers and triathletes, cold water entering the ear canal can trigger a disorienting wave of dizziness. A study of triathletes found that roughly three-quarters of participants experienced dizziness during an open-water swim leg when they were not wearing earplugs. The cause is a caloric response: cold water cools one ear’s vestibular organ (the balance sensor in the inner ear) more than the other, producing involuntary eye movements and a spinning sensation.
When the same athletes repeated the swim wearing earplugs, only one out of the group experienced dizziness. The improvement was striking enough that the researchers attributed most open-water swim dizziness to this uneven cooling effect. If you have ever felt wobbly or nauseated after an open-water swim, earplugs may solve the problem entirely. This is especially relevant in triathlons, where athletes exit the water and immediately get on a bike, so lingering dizziness becomes a safety concern, not just an annoyance.
Children with Ear Tubes
Parents of children with ventilation tubes (grommets) are almost always told to keep water out of their child’s ears. The logic seems obvious: the tubes create a direct channel through the eardrum, so water that enters the canal can reach the middle ear and cause infection. But the evidence on whether strict water precautions actually help is surprisingly thin.
A randomized trial comparing children who swam and bathed with earplugs to those who did not found a small but statistically significant reduction in ear discharge episodes among the earplug group. However, the practical size of the benefit was tiny. A Cochrane systematic review that pooled the available evidence concluded that an average child would have to wear earplugs for about 2.8 years to prevent a single episode of ear discharge. The review also found some evidence suggesting that simply telling children to avoid swimming or going underwater during baths did not affect discharge rates at all.
Because the baseline rate of infection through tubes is usually low, current consensus guidelines recommend against routine water precautions for children with grommets. The reasoning is that the small clinical benefit is outweighed by the cost, inconvenience, and anxiety that strict water rules create, especially for families where swimming is an important part of a child’s social and physical development. That said, some ear-nose-and-throat specialists still advise plugs in specific situations, like swimming in lakes or when a child has a history of frequent ear discharge episodes. If your child has grommets, the decision is worth discussing with their doctor, but the blanket “never get their ears wet” advice is outdated for most kids.
Surfer’s Ear and Long-Term Cold Water Exposure
Keeping water out takes on a different significance for people who spend years in cold water. Surfers, cold-water kayakers, and open-water swimmers are at risk for developing bony growths in the ear canal called exostoses, commonly known as surfer’s ear. These growths narrow the canal over time, making it harder for water to drain and easier for infections to take hold.
A study of surfers found that more than half had some degree of exostosis, with risk increasing sharply after six or more years of surfing, during winter months, and with more frequent sessions in cold conditions. A systematic review confirmed that cold water exposure combined with wind and prolonged activity drives this growth process.
Exostoses develop slowly and are painless in the early stages, so many surfers do not realize they have them until the canal is significantly narrowed and they start getting recurrent infections or persistent water trapping. At advanced stages, surgery is the only treatment. Earplugs are the primary preventive measure. For cold-water athletes, this is not about avoiding the occasional earache after a swim. It is about protecting the physical structure of the ear canal over a career that may span decades. Neoprene hoods and earplug-plus-headband combinations are popular in surfing communities for exactly this reason.
Practical Tips for Different Swimming Scenarios
The “best” approach depends on what kind of swimmer you are. Here is how the evidence maps onto common situations:
- Casual pool swimmer: Moldable silicone earplugs if you are prone to infections or find trapped water annoying. Post-swim ear drying with a tilt-and-shake and an optional alcohol-vinegar rinse. This combination handles the vast majority of pool-related ear problems.
- Lake or river swimmer: Earplugs become more important here because freshwater carries higher bacterial loads. Combine silicone plugs with post-swim drying drops, and rinse the outer ear with clean water after your swim.
- Open-water or triathlon swimmer: Earplugs serve double duty, reducing both infection risk and cold-water dizziness. Choose a low-profile plug that does not interfere with your goggle strap or swim cap. Some athletes prefer custom-molded plugs for a secure fit during racing.
- Surfer or cold-water athlete: Earplugs are a long-term investment in ear health. Pair them with a neoprene headband or hood. The goal is not just keeping water out of a single session but preventing cumulative bone growth over years.
- Competitive swimmer or diver: Accept that no plug fully blocks water during dives. Use plugs to reduce entry, add a swim headband for extra security, and be diligent about drying ears post-session.
One common mistake is assuming that swim caps keep water out of your ears. Standard latex and silicone swim caps are designed to reduce drag and keep hair out of your face, not to create a watertight seal around the ears. Water flows freely under the edges. A cap can help hold earplugs in place, which is useful, but it is not a substitute for plugs on its own.
When to See a Doctor
If you consistently get water trapped in one ear more than the other, or if trapped water causes pain, persistent muffled hearing, or discharge, something else may be going on. Earwax buildup can create a dam that traps water. An unusually narrow or sharply curved canal can do the same. Exostoses, as discussed above, progressively narrow the canal. A doctor can examine your ear canal with an otoscope and identify whether a structural issue is making the problem worse. In some cases, professional earwax removal or treatment of an underlying condition resolves chronic water-trapping that no earplug could fully address.
Ear pain that develops a day or two after swimming, especially if accompanied by itching, redness, or discharge, likely signals swimmer’s ear. This is the point where over-the-counter drops are no longer enough and you need prescription antibiotic ear drops. Catching it early makes treatment straightforward; letting it linger can lead to a stubborn infection that takes weeks to clear.