If you want open-ear headphones for everyday activity and simple USB-C charging for kids, choose flymory Bone Conduction Headphones; if you need waterproof swimming use with built-in MP3 storage for kids, choose MARLALL Liquid Silicone Swimming.
The key difference is what happens when the headphones meet water: flymory is rated IPX5 for sweat and light rain, while MARLALL is described as IP68 waterproof and has a 32 GB MP3 mode for swimming. Both use an open-ear bone-conduction design, but their strengths suit different routines.
• flymory’s biggest strength: Open-ear listening, a flexible titanium-alloy neckband, and Type-C charging. Its trade-off is that IPX5 protection is for sweat and small amounts of rain, not underwater swimming.
• MARLALL’s biggest strength: IP68 waterproofing and 32 GB of built-in MP3 storage for listening while swimming. Its trade-off is that you must switch to MP3 mode underwater because Bluetooth signals do not transmit underwater.
• For everyday movement: flymory is a straightforward fit for running, cycling, workouts, and calls while keeping the ears open to surrounding sound.
• For pool sessions: MARLALL is the more relevant choice, provided you are comfortable loading music to its built-in storage and using MP3 mode in the water.
• Choose flymory for a flexible neckband and USB-C charging; choose MARLALL for swimming and onboard music storage.
flymory is an open-ear bone-conduction headset aimed at activity beyond the pool. Its design sends audio through bone conduction while leaving the ears uncovered, so the wearer can still hear nearby sounds. That can make sense for a child listening during a supervised walk, a bike ride, or a workout, where awareness of the surroundings matters alongside music or podcasts. The ear hooks and flexible titanium-alloy neckband are intended to help it stay in place during exercise.
Charging is another practical point. The headset uses a Type-C port, and the listed charge time is two hours. The product information gives 10 hours as an average battery life, while its feature description specifies up to 12 hours of music, calls, and podcasts at 50% volume, falling to eight hours at 80% volume. Those different figures make it sensible to treat runtime as dependent on listening level and use, rather than plan around the longest stated figure. Bluetooth 5.3 supports wireless connection, with a stated range of up to 10 meters.
I would consider flymory for a child who needs an open-ear option for everyday sports and whose routine includes charging from a USB-C cable. It is not the right pick for swimming: IPX5 is described as protection against sweat and small amounts of rain, not underwater use. Families searching for the best USB C charging bone conduction headphones for kids may find its charging setup relevant, but the fit and suitability for a particular child still deserve attention. The product’s age-range field says over 18, so it should not be treated as specifically designed for children.
MARLALL is the clearer choice when swimming is the central use. It is described as IP68 waterproof, and its 32 GB of built-in memory is intended to hold music for playback without a live Bluetooth connection. The instructions specify switching to MP3 mode in the water because Bluetooth cannot transmit underwater. That distinction matters: the swimmer should prepare music on the headset rather than expect a phone connection to keep streaming from the pool deck.
Outside the pool, MARLALL also works as a wireless open-ear bone-conduction headset with Bluetooth 5.4 and a stated 10-meter range. Its silicone construction and adjustable straps are presented as part of a comfortable, secure fit. The product information lists a weight of 22.68 g. This may appeal to someone who wants one headset for swimming and land activities, though the available specifications do not provide a battery runtime or charge time, so I would not assume how long it can play between charges.
How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-17 · 12 min read · Independent comparison
• Best for swimming → MARLALL Liquid Silicone Swimming. It is described as IP68 waterproof and includes 32 GB of built-in memory. Use MP3 mode in the water; Bluetooth does not work underwater.
• Best for sweat and light rain → flymory Bone Conduction Headphones. Its IPX5 rating is described for sweat and small amounts of rain, not submersion.
• Best for USB-C charging → flymory Bone Conduction Headphones. It has a Type-C charging port and a listed two-hour charge time.
• Best for listening without a phone connection in the pool → MARLALL Liquid Silicone Swimming. Its built-in MP3 storage is the useful distinction for underwater listening.
• Best for a stated everyday battery figure → flymory Bone Conduction Headphones. Its product information lists an average life of 10 hours; the feature details say up to 12 hours at 50% volume and eight hours at 80%.
• Best for newer Bluetooth version → MARLALL Liquid Silicone Swimming. It lists Bluetooth 5.4, compared with flymory’s Bluetooth 5.3. Both specify a range of 10 meters.
• Best for a flexible neckband design → flymory Bone Conduction Headphones. Its titanium-alloy neckband is described as bendable, with ear hooks intended to support a stable fit during exercise.
• Best for a buyer comparing sports earbuds for kids → choose by activity, not the label. For land-based exercise and Type-C charging, flymory has the clearer fit; for swimming with stored music, MARLALL does. Neither product’s age-range information identifies it as designed for children.
In my opinion, I would choose flymory for a child’s everyday sports listening if swimming is not part of the plan. Its open-ear design, Type-C charging, and stated battery information make its use case easier to judge.
If the child regularly swims, I would choose MARLALL instead, because its IP68 description and built-in MP3 storage address the key underwater needs. For kids, I would confirm fit and adult supervision either way; the product information lists both as adult-oriented.
No. MARLALL’s instructions specifically say Bluetooth signals cannot transmit underwater, so use its MP3 mode while swimming. flymory is described for sweat and small amounts of rain, not underwater listening.
MARLALL is the more suitable match based on the listed IP68 waterproofing and built-in 32 GB memory. A swimmer needs to use MP3 mode in the water, and the product information identifies its age range as adult, so caregivers should assess fit and suitability.
flymory has the more detailed battery information: the product details list an average life of 10 hours, while the feature description gives up to 12 hours at 50% volume and eight hours at 80%. MARLALL’s supplied information does not state a battery runtime.
No. Its IPX5 protection is described for sweat and small amounts of rain, not submersion. For swimming, MARLALL is the relevant option of these two, with MP3 mode used underwater.
If you want open-ear headphones for everyday activity and simple USB-C charging for kids, choose flymory Bone Conduction Headphones; if you need waterproof swimming use with built-in MP3 storage for kids, choose MARLALL Liquid Silicone Swimming.
The central difference is how each handles water. flymory is rated IPX5 for sweat and small amounts of rain, while MARLALL is described as IP68 waterproof and includes 32 GB of built-in MP3 storage for swimming. Both use open-ear bone conduction, but they suit different routines: one is oriented toward everyday movement, the other toward pool use.
• flymory’s biggest strength: Open-ear listening, a flexible titanium-alloy neckband, and Type-C charging. Its trade-off is that IPX5 protection is for sweat and light rain, not underwater swimming.
• MARLALL’s biggest strength: IP68 waterproofing and 32 GB of built-in MP3 storage for listening while swimming. Its trade-off is that you need to switch to MP3 mode underwater because Bluetooth signals cannot transmit underwater.
• For everyday movement: flymory is a straightforward fit for running, cycling, workouts, and calls while keeping the ears open to surrounding sound.
• For pool sessions: MARLALL is the more relevant pick, provided you are comfortable loading music to its built-in storage and using MP3 mode in the water.
• Choose flymory for a flexible neckband and USB-C charging; choose MARLALL for swimming and onboard music storage.
flymory is an open-ear bone-conduction headset for activities beyond the pool. It sends audio through bone conduction while leaving the ears uncovered, so the wearer can still hear nearby sounds. That may suit a child listening during a supervised walk, bike ride, or workout, where awareness of surrounding sounds matters alongside music or podcasts. Its ear hooks and flexible titanium-alloy neckband are intended to help it stay in place during exercise.
Charging is practical to assess: flymory uses a Type-C port, and the listed charge time is two hours. Battery information is not presented as one simple figure. The product details list an average life of 10 hours, while the feature description says up to 12 hours of music, calls, and podcasts at 50% volume, dropping to eight hours at 80%. I would treat runtime as dependent on volume and use rather than plan around the longest stated figure. Bluetooth 5.3 supports wireless connection, with a stated range of up to 10 meters.
I would consider flymory for a child who needs open-ear listening for land-based sports and whose routine includes charging from a USB-C cable. It is not the right choice for swimming: IPX5 is described as protection against sweat and small amounts of rain, not submersion. Families searching for the best USB C charging bone conduction headphones for kids may find its charging setup relevant, but should also consider fit and age suitability. The product’s age-range field says over 18, so it is not identified as specifically designed for children.
MARLALL is the clearer choice when swimming is the main use. It is described as IP68 waterproof and has 32 GB of built-in memory for music playback without a live Bluetooth connection. The instructions specify switching to MP3 mode in the water because Bluetooth cannot transmit underwater. In other words, a swimmer should prepare music on the headset rather than expect a phone connection to stream from the pool deck.
Outside the pool, MARLALL also works as a wireless open-ear bone-conduction headset with Bluetooth 5.4 and a stated 10-meter range. Its silicone construction and adjustable straps are presented as features intended to support a comfortable, secure fit. The product information lists its weight as 22.68 g. It may suit someone who wants one headset for swimming and land activities, but the supplied specifications do not state battery runtime or charge time, so I would not assume how long it plays between charges.
For a child who swims regularly and can follow the MP3-mode requirement, MARLALL has the more relevant feature set. It is also the more specialized pick: if the main need is ordinary listening with USB-C charging, the provided information does not establish that MARLALL offers that port. Its age-range field says adult, so caregivers should check fit and suitability rather than assume it is made for kids. Anyone considering a neckband headphones gift for kids should weigh that caution alongside the appeal of onboard music storage.
• Best for swimming → MARLALL Liquid Silicone Swimming. It is described as IP68 waterproof and includes 32 GB of built-in memory. Use MP3 mode in the water; Bluetooth does not transmit underwater.
• Best for sweat and light rain → flymory Bone Conduction Headphones. Its IPX5 rating is described for sweat and small amounts of rain, not submersion.
• Best for USB-C charging → flymory Bone Conduction Headphones. It has a Type-C port and a listed two-hour charge time.
• Best for listening without a phone connection in the pool → MARLALL Liquid Silicone Swimming. Built-in MP3 storage is the useful distinction for underwater listening.
• Best for a stated everyday battery figure → flymory Bone Conduction Headphones. Its product information lists an average life of 10 hours; the feature details say up to 12 hours at 50% volume and eight hours at 80%.
• Best for the newer Bluetooth version → MARLALL Liquid Silicone Swimming. It lists Bluetooth 5.4, compared with flymory’s Bluetooth 5.3. Both specify a 10-meter range.
• Best for a flexible neckband design → flymory Bone Conduction Headphones. Its titanium-alloy neckband is described as bendable, with ear hooks intended to support a stable fit during exercise.
• Best for comparing sports earbuds for kids → choose by activity, not the label. For land-based exercise and Type-C charging, flymory has the clearer fit; for swimming with stored music, MARLALL does. Neither product’s age-range information identifies it as designed for children.
My Verdict
In my opinion, I would choose flymory for a child’s everyday sports listening if swimming is not part of the plan. Its open-ear design, Type-C charging, and stated battery information make its use case easier to judge.
If the child regularly swims, I would choose MARLALL instead, because its IP68 description and built-in MP3 storage address the key underwater needs. For kids, I would confirm fit and use adult supervision either way; the product information lists both as adult-oriented.
No. MARLALL’s instructions say Bluetooth signals cannot transmit underwater, so use its MP3 mode while swimming. flymory is described for sweat and small amounts of rain, not underwater listening.
MARLALL is the closer match based on its listed IP68 waterproofing and built-in 32 GB memory. A swimmer needs to use MP3 mode in the water, and the product information identifies its age range as adult, so caregivers should assess fit and suitability.
No. Its IPX5 protection is described for sweat and small amounts of rain, not submersion. Of these two, MARLALL is the swimming option, with MP3 mode used underwater.
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