Earplugs for Cold Water Swimming

Key takeaways

Cold water swimming is now one of the UK’s most popular outdoor pursuits, from early-morning lido regulars to year-round wild swimmers braving rivers and coastal stretches in every season. What most new participants do not realise is that cold water swimming without ear protection accumulates damage across every unprotected session, silently and without symptoms, until an ENT surgeon presents them with an X-ray showing bone that has grown across their ear canal. That process starts at water temperatures below 19°C, which covers almost every British swimming site for most of the year.

Earplugs are the only practical way to interrupt that process before it becomes surgical. For a full overview of earplugs for swimming across all disciplines, pool and open water, see our complete swimming cluster hub. This article focuses specifically on cold water and wild swimming, where the exostosis risk is highest and where standard pool earplugs are most likely to fall short.

Do you actually need earplugs for cold water swimming?

Cold water swimmers need earplugs because water below 19°C repeatedly stimulates bone-producing cells in the wall of the ear canal, causing progressive bony growth that narrows the canal over years of unprotected exposure. According to research published in StatPearls (NCBI), the risk threshold is 19°C (66°F), below which cold water contact induces vasodilation in the bony auditory structure, triggering a slow bone-laying response. UK sea temperatures average 6-10°C in winter and reach only 15-20°C at their warmest. Rivers and inland lakes typically sit at 8-15°C year-round, keeping cold water swimmers below the risk threshold in almost every session.

The misconception that costs wild swimmers their hearing is that auditory exostosis, commonly called surfer’s ear, is a problem for surfers and not for open water or wild swimmers. The condition is triggered by cold water temperature, not by the sport. A swimmer doing two sessions per week in a Scottish loch, a Yorkshire reservoir, or an English coastal stretch accumulates equivalent cold water exposure to a regular surfer and carries equivalent risk.

Many in the wild swimming community report going years without earplugs and feeling completely fine. This is precisely how the condition works: bone growth begins well before it produces any symptom. The canal narrows in silence, and the first signs — trapped water, recurring ear infections, muffled hearing — appear a decade after the damage started.

At what water temperature does ear damage begin?

Auditory exostosis begins to develop at repeated cold water exposure below 19°C (66°F), with risk increasing measurably each year of continued contact at or below this threshold. The Irish Health Service Executive clinical guidance on surfer’s ear confirms that swimmers and water sports participants with frequent cold water contact are in a high-risk group, noting that coastal waters in the British Isles average 13-17°C even in their warmest months, placing them permanently below the 19°C risk threshold.

Research quantifies how quickly risk accumulates. Each year of sustained cold water exposure increases exostosis risk by approximately 12%. Among surfers, the most thoroughly studied cold water athlete population, approximately 1 in 2 males who have been in the water for 20 or more years develop clinically significant exostosis. The condition is almost never diagnosed early because early-stage bone growth produces no symptoms and does not affect hearing. By the time a swimmer notices reduced hearing or recurrent ear infections, the canal has typically narrowed substantially.

Wind chill compounds the temperature effect. Cold wind across a wet ear after exiting the water adds thermal stress to the canal even when the swimmer is no longer submerged. This is particularly relevant for wild swimmers who cover distance in exposed coastal or upland environments and spend time on shore between sessions.

What is surfer’s ear, and do cold water swimmers develop it?

Surfer’s ear, or auditory exostosis, is the progressive bony narrowing of the external ear canal caused by repeated cold water contact, confirmed by medical literature to affect 26-73% of surfers depending on years of exposure. Cold water entering the canal triggers inflammation and an increase in vascular tension within the bony auditory structure. The body responds by laying down new bone across repeated exposures. Over 10-15 years, the canal narrows enough to trap water and earwax, cause recurrent otitis externa, and eventually produce conductive hearing loss. Severe cases require canalplasty surgery, in which the excess bone is drilled away under general anaesthetic, followed by a 2-3 month recovery period before returning to the water.

For a detailed explanation of the mechanism, risk factors, and how to recognise early symptoms, the article on what is surfer’s ear (auditory exostosis)? covers the condition in full.

Wild swimmers and open water swimmers in the UK face the same exostosis risk as surfers because the triggering mechanism is the same. A study of 207 UK surfers found that exostosis prevalence and severity increased significantly after five years of cold water exposure. Open water swimmers who enter UK cold water two or three times per week accumulate equivalent exposure over the same period. The sport label is irrelevant — the ear canal does not distinguish between a surfer and a wild swimmer when both are putting it in 10°C water.

Which type of earplug is best for cold water swimming?

For cold water swimming, flanged medical-grade silicone earplugs with a multi-lamellae design outperform foam, moldable wax, and single-flange alternatives because multiple independent sealing rings maintain a waterproof barrier through the thermal, mechanical, and movement conditions specific to cold open water. The comparison below covers the earplug types most commonly considered by wild swimmers and open water athletes:

Foam earplugs absorb water and should never be used in any water environment. Moldable wax and putty plugs can form a surface seal in still pool water but are unreliable in rough or turbulent open water, particularly in cold conditions where the wax hardens and loses its pliability. Custom-moulded earplugs from an audiologist offer excellent retention but at a cost that most recreational wild swimmers find difficult to justify for regular use.

The practical choice for most cold water swimmers is a flanged medical-grade silicone earplug with at least two lamellae. For a detailed breakdown of all four earplug types, the guide to which type of earplug is best for cold water? covers materials, fit systems, and use-case suitability in full.

What makes earplugs stay in during cold open water swimming?

Earplugs stay in during cold open water swimming when the design uses multiple independent sealing lamellae, because a single-ring seal cannot hold against the combined forces of cold-induced tissue contraction, wave pressure, and rotational head movements that open water swimming creates across a full session. Wild swimmers encounter conditions that pool swimmers rarely face: waves applying lateral pressure to the earplug, cold shock during immersion altering how the canal wall contacts the plug, and sustained head rotation during breathing and sighting.

Multi-lamellae designs address this with redundancy. If the outer flange flexes away from the canal wall briefly under a wave impact, the inner flange maintains the barrier. Cold water causes slight vasoconstriction and tissue firming around the ear canal after 15-20 minutes in the water. An earplug that fits well at the water’s edge may feel fractionally different by the time a swimmer has covered 500 metres in cold water — a precisely fitted plug narrows this variation significantly.

One practical detail that experienced open water swimmers share: insert earplugs on dry land before putting on a wetsuit hood, not after. Inserting through a hood reduces precision and makes it difficult to confirm the seal by feel. Cold and numb fingers make the problem worse.

Are Bollsen Watersafe+ earplugs suitable for cold water swimming?

Bollsen Watersafe+ earplugs (24 dB SNR, medical-grade silicone, BPA-free, reusable up to 100 times, £26.95) are designed specifically for swimming and open water use, with a conical 2-lamellae design that creates a dual-ring waterproof seal. The outer lamella forms a broad initial contact point against the outer ear canal. The inner lamella provides a secondary pressure ring that holds when the outer seal is challenged by wave pressure, head movement, or the tissue changes that cold water causes over a long session. The medical-grade silicone is free of BPA, PVC, plasticisers, latex, and cadmium. Each pair comes with an aluminium carry case and is backed by a 40-day money-back guarantee.

Swimming earplugs only work consistently when they fit the individual ear canal correctly. For cold water swimmers who have previously struggled with standard sizing, or whose sessions are frequent enough that a marginally loose earplug will eventually shift, Bollsen’s AR KI TECH sizing system analyses two photos of the ear using augmented reality and AI in approximately 2 minutes to recommend the correct size for each individual canal. Watersafe+ AR KI TECH (£38.95) achieves a 3% return rate, compared to a significantly higher industry average for standard earplugs, because the sizing step removes the guesswork from first purchase. No app or download is required, and photos are not stored or shared. At approximately 55% cheaper than audiologist custom earmolds, it is a practical alternative for cold water swimmers who want precision fit without the clinic appointment.

For a complete guide covering all earplug types across every use case and price point, the complete swimming earplugs buyer’s guide covers the full range from moldable wax to AR KI TECH custom sizing. For detailed advice specific to open water retention and cold water conditions, the complete guide to open water swimming earplugs covers the specific performance challenges that cold water swimmers face.

How should you insert earplugs before a cold water session?

Insert swimming earplugs before entering the water, while your hands are still dry and at full dexterity, because cold water numbs fingers quickly and makes it difficult to seat the inner lamella correctly or confirm the seal by feel once you are standing at the water’s edge. The correct sequence for a cold water session is: earplugs in first, hood on, then enter. Reversing any step compromises the seal at the moment of first immersion when cold water pressure is highest.

For the full insertion technique, including how to gently pull the outer ear to widen the canal before seating the plug, the article on correct insertion for cold water swimming walks through each step for first-time users and experienced swimmers whose plugs keep shifting mid-session.

Cold water swimmers wearing neoprene gloves should insert earplugs before the gloves go on. If swimming with a partner, ask them to confirm both earplugs are visibly flush and seated before entering the water. And one detail the wild swimming community often learns the hard way: click the carry case lid shut before putting it down near the water. An open aluminium case at a windy river bank is not a retrieval plan.

Why protecting your ears now matters more than it will later

Auditory exostosis develops silently over years of cold water exposure, and UK rivers, lakes, and coastal waters sit below the 19°C risk threshold for most or all of the year. The swimmer who feels fine today may already be building the bone growth that will require a canalplasty under general anaesthetic in a decade. The academic research is unambiguous: consistent earplug use is the most effective and cost-effective way to reduce exostosis risk in cold water athletes.

Flanged medical-grade silicone earplugs are the only earplug type that reliably creates a waterproof seal in cold open water conditions. Bollsen Watersafe+ (24 dB SNR, medical-grade silicone, reusable up to 100 times, £26.95) is built for this use case, with a dual-lamellae seal that holds through open water head movements, wave exposure, and cold-induced tissue changes. For swimmers who want precision fit for frequent or long cold water sessions, Watersafe+ AR KI TECH (£38.95) delivers custom sizing from two photos in approximately 2 minutes, with a 3% return rate that reflects how well the fit holds when the sizing is done correctly.