We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-09 · 8 min read · Independent comparison
For airplane use, my top pick is the GREYOLK Swimming Headphones (B0FDWBX6LD) — it pairs a genuinely waterproof build with 32GB of onboard storage, which is exactly the combination that saves you when in-flight Bluetooth is restricted and you want your own audio without a phone.
• GREYOLK Swimming Headphones — best for long-haul flights and pool training in one pair; pick this if you want the longest warranty and the lighter 15mm driver build.
• GREYOLK Swimming Headphones — best for travellers who want the newer Bluetooth spec; pick this if you'd rather have Bluetooth 5.4 listed on the box and a larger 30mm bone conduction driver.
• Puro Sound Labs — best for everyday gym and outdoor listening; pick this if you want a lightweight silicone-wrapped frame and a grey colourway, and you don't need swimming-level waterproofing.
• RR SPORTS IP68 — best for swimmers who want maximum stored music; pick this if 32GB holding around 7,000 songs and a submersible rating matters more to you than battery time.
This is the model I'd hand to someone who flies a lot and also swims. The headline spec is IP68 — the highest waterproof rating in this group — and GREYOLK explicitly says it can be worn with a swimming cap, goggles and earplugs. On a plane that rating is less about dunking and more about reassurance: sweat, spilled drinks, rain on the jet bridge and general travel abuse are all covered. The ABS shell and open-ear titanium-style wraparound frame are built to stay put during movement.
The 32GB of built-in memory is the part that actually matters at 35,000 feet. It holds roughly 6,000 songs across MP3, WMA, WAV, APE and FLAC, and you load it by plugging the magnetic charging cable into a computer and treating the headphones as a memory disk. Double-click the power button to switch between Bluetooth and MP3 mode. That means you can leave your phone in your bag, or in airplane mode, and still have hours of your own audio.
Bluetooth 5.4 is listed on the title and bullets, which points to stronger interference resistance and better connection stability than older chips — useful in a cabin packed with hundreds of competing wireless signals. Range is up to 10 metres. Battery is a 150mAh cell: 1.5 hours to charge, up to 8 hours of playback or talk time, which comfortably covers a transatlantic flight if you're not running it the whole way.
Trade-offs worth knowing. One data sheet lists Bluetooth 5.3 under the style field while the marketing copy says 5.4, so treat the exact chip revision as a detail rather than a guarantee. Weighing 32 grams it's light, but the open-ear design means cabin noise gets in — this is not a noise-cancelling headphone, and the "Active Noise Cancellation" field here should not be read as the isolating kind you'd get from over-ears. It also has no headphone jack. In my opinion, the 2-year manufacturer warranty makes it the safest long-term bet of the four.
GREYOLK Swimming Headphones
Where it differs is the audio hardware. This version lists a 30mm bone conduction driver against the 15mm on the other model, plus a stated 88dB sensitivity and a 20Hz–20kHz frequency range. A larger driver generally moves more air and can sound fuller at low volumes, which matters when you're trying to hear a podcast over engine drone without cranking it. The Bluetooth version field here reads 5.4, matching its own marketing copy, so the spec sheet is at least self-consistent on that point.
It's also the version that ships with a carrying case, and the built-in media list is just the user manual — no cable in the box list, though the magnetic charging cable is referenced in the feature text, so I'd confirm what's actually included before you rely on it for file transfers. The listing notes it's aimed at adults.
The main trade-off is warranty: this one is described as 2-year in the product information but the after-sales bullet says 1 year. That inconsistency is worth a question to the seller. Compared with the first GREYOLK, I'd pick this one if you care more about the bigger driver and the case, and the other if you want the cleaner, longer warranty story.
This is the odd one out, and that's the point. Puro Sound Labs is a grey-and-white open-ear bone conduction headphone with a silicone-wrapped frame, a rounded/angular earpiece design, and a stated 85dB volume limit — a design decision aimed squarely at protecting your hearing during long listening sessions. For a flight, a volume ceiling is genuinely appealing: you're not tempted to blast past safe levels to drown out the cabin.
Connectivity is Bluetooth 5.3 with a built-in mic, so calls and voice prompts work. It charges magnetically in about 6 hours per the battery field, which is slow, and gives up to 6 hours of playback — the shortest runtime here. The carrying case adds 5 ounces. Controls are touch rather than buttons. It's rated IPX5, which handles sweat, rain and moisture but is not a swimming rating and won't survive submersion.
So who is it for? Someone who wants a light, secure, grey open-ear headphone for running, gym work and travel, and who values the hearing-protection angle over water resistance and storage. There's no onboard MP3 memory here, so it's Bluetooth-only — meaning if your airline restricts Bluetooth, you're relying on the seatback screen or a wired alternative you'd have to bring yourself.
The trade-offs are real for this specific use case: no built-in storage, the shortest battery life of the four, the slowest charge, and a 1-year warranty. In my opinion it's the best pick here for the gym and the worst pick for a long-haul flight. If your travel is short hops and your priority is a comfortable everyday fitness headphone in grey, this is a sensible choice.
If your definition of "grey bone conduction headphones" starts with swimming, this is the one to look at hardest. RR SPORTS rates it IP68 with a stated ability to withstand submersion in up to 2 metres of water, and pairs that with a sealed design plus a nano-hydrophobic coating to keep sweat, rain and pool water out of the internals. Comfort-wise it uses ultra-soft silicone with an adjustable strap, and the listing shows it worn with both swim caps and goggles.
Storage is the standout: 32GB holding up to around 7,000 songs across MP3, WMA, WAV and FLAC — the largest capacity in this roundup. Same workflow as the GREYOLK units: magnetic charging cable to your computer, drag files over, then switch to MP3 mode. The listing is blunt that Bluetooth doesn't work underwater, so MP3 mode is mandatory in the pool.
Bluetooth is listed as 6.0 in the title and bullets with 10 metres of range and compatibility with iOS, Android and other devices, plus up to 7 hours of battery from a 2-hour charge. The controls are touch, and the colour is dark grey with a silicone enclosure.
The honest trade-offs: 7 hours of battery is a step below the GREYOLK pair, and the charge time is longer at 2 hours. The Bluetooth version is inconsistent across the sheet — the style field says 5.4 while the copy says 6.0 — so don't buy it purely for the chip number. There's no stated warranty period, which is the biggest gap versus the GREYOLK models. As a sweat-resistant option for hard training and a reliable offline music player for travel, though, the spec sheet reads well.
I compared the published specifications and feature lists for these four grey and dark-grey bone conduction models — waterproof rating, onboard storage, Bluetooth version, driver size, battery figures, weight, materials and stated warranty — and weighed them against the realities of air travel: cabin noise, restricted wireless modes, long wear times and the need for your own audio without a phone. The ranking is my independent editorial opinion, not a measurement lab result, and no brand paid for placement or saw this guide before publication.
FAQ
They can work, because the open-ear fit means you're not sealed off and can still hear cabin crew. But all four have a rigid wraparound frame, so they're less forgiving against a headrest than a soft fabric sleep band. If you sleep on your side, expect to reposition them.
Not strictly — IPX5, like the Puro Sound Labs model, already handles sweat and rain. IP68 matters if the same pair will go in a pool or shower, and it also gives you more margin against spills and humidity on the road.
Bluetooth mode streams from your phone or tablet within about 10 metres. MP3 mode plays files stored in the headphones' built-in memory instead. The GREYOLK and RR SPORTS units switch between the two with a button press, and none of them transmit Bluetooth through water.
For airplane travel specifically, I'd go with the first GREYOLK model — IP68 protection, 32GB of offline music, 8 hours of playback and a 2-year manufacturer warranty make it the most complete travel companion of the four.
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