If you want a rugged, dedicated underwater audio solution for intense lap swimming and water sports, choose SEWOBYE Waterproof MP3; if you need a soft, wireless headband that doubles as a sleep mask for side sleepers or meditation, choose Fulext Sleep Headphones.
• SEWOBYE Waterproof MP3: Strength is its IPX8 waterproof rating and 16-hour battery life designed for submersion; trade-off is the wired headphone setup with short cords that limit movement outside the pool. Best for serious swimmers who need to listen to music while fully submerged.
• Fulext Sleep Headphones: Strength is its ultra-thin HD speakers and Bluetooth 5.4 connectivity for seamless wireless use during sleep or travel; trade-off is the lack of true waterproofing and reliance on a rechargeable fabric band that cannot be submerged. Best for light sleepers, travelers, and those needing white noise for relaxation.
This device is built specifically for people who treat their swim workouts like professional training sessions. The SEWOBYE unit is not just a player; it is an integrated system designed to survive the harshest aquatic environments. With an IPX8 rating capable of withstanding submersion up to three meters (roughly 10 feet), this is the tool for the lap swimmer or marathon athlete who refuses to let a splash stop their rhythm. The design prioritizes function over form in a way that only matters when you are under water. The control buttons feature raised ridges specifically engineered for wet fingertips, allowing you to navigate tracks or adjust volume without ever taking your goggles off or looking at the device. This tactile feedback is crucial when your hands are slippery and visibility is zero.
The audio experience here is distinct because it does not rely on a phone sitting by the pool deck. You get 8 GB of internal memory, which translates to storing over 2,000 songs directly on the player. This means you can load your entire workout playlist, audiobooks, or coaching podcasts and leave your smartphone behind. The device supports high-quality formats including FLAC, APE, and WMA alongside standard MP3s, ensuring you get HIFI lossless sound quality even underwater. While many cheap players distort heavily once the water hits them, this unit uses gold-plated stereo jacks to prevent corrosion and maintain clarity. The included headphones feature a short cord design that prevents the dreaded tangling issue common with longer cables wrapping around goggle straps during vigorous strokes.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-30 · 7 min read · Independent comparison
Who should buy this? If you are looking for comfortable sports earbuds for music production or training that can actually handle being underwater, this is your only real option among these two. It is also ideal for surfers, kayakers, or skiers who face similar moisture challenges. However, if you plan to use this strictly for casual listening in the shower or while walking, you will find the setup too cumbersome. The requirement to download files via USB cable to a computer before each trip might feel archaic compared to streaming, but for a swimmer in the middle of a lake or ocean, that reliability is everything. Skip this if you need a device for sleeping; the rigid plastic body and wired connection make it impossible to lie on comfortably.
The Fulext Sleep Headphones take a completely different approach, focusing entirely on comfort and versatility for land-based relaxation. This isn't about surviving a dive; it is about creating a cocoon of silence and sound. The core innovation here is the integration of ultra-thin HD speakers into a soft, breathable fabric headband. These speakers are flat enough that they do not press against your ears, making them genuinely viable for side sleepers who usually crush traditional earbuds or bulky headphones into their pillow. The material is hypoallergenic and moisture-wicking, designed to keep you cool through the night or during a hot yoga session. Unlike the hard plastic of the SEWOBYE, this headband feels like a premium accessory rather than a piece of electronics.
Connectivity is where this product shines for the modern user. It utilizes Bluetooth 5.4 technology, ensuring a stable, instant connection to your phone, tablet, or laptop without the hassle of tangled wires. The 40mm drivers deliver crisp audio suitable for podcasts, sleep meditations, white noise, or music. You can also take hands-free calls using the built-in microphone, turning the headband into a versatile daily driver for work or travel. The battery life supports up to 14 hours of continuous play, which covers most overnight cycles and long flights, recharging quickly via Type-C in just one to two hours. Perhaps the most practical feature for the eco-conscious or busy parent is that the electronics are removable, allowing the fabric headband itself to be machine washed—a necessity for anyone who sweats or deals with oils during sleep.
Who should buy this? This is the perfect choice for anyone struggling with insomnia or seeking a better way to block out household noise. It serves as a great alternative to traditional wireless earbuds for side sleepers who find those uncomfortable after an hour. It is also an excellent gift for teens or adults who value a "cool gadget" that helps them wind down. However, if you have any intention of using this near water, skip it immediately. The fabric construction and electronic components are not rated for submersion, and the Bluetooth signal will fail the moment it gets wet. It is a fantastic tool for the bedroom, the office, or the gym, but it has no place in the pool.
• Best for underwater immersion → SEWOBYE Waterproof MP3. Its IPX8 rating and gold-plated connectors allow it to function flawlessly at depths of 10 feet, whereas the Fulext will be destroyed instantly.
• Best for side sleepers → Fulext Sleep Headphones. The ultra-thin speakers and soft fabric headband eliminate pressure points that would wake you up, something a hard plastic MP3 player cannot do.
• Best for wireless freedom → Fulext Sleep Headphones. Bluetooth 5.4 allows you to move freely without worrying about cord length or tangling, unlike the fixed short cords of the SEWOBYE.
• Best for offline storage → SEWOBYE Waterproof MP3. With 8 GB of internal memory holding 2,000+ tracks, you don't need a phone nearby, which is essential for poolside safety and simplicity.
• Best for hygiene and cleaning → Fulext Sleep Headphones. The removable electronics mean the fabric part can go in the washing machine, a feature the SEWOBYE lacks entirely due to its sealed electronics.
• Best for high-fidelity audio formats → SEWOBYE Waterproof MP3. It natively supports FLAC and APE files for lossless playback, catering to audiophiles who care about sound fidelity during training.
• Best for multi-use versatility → Fulext Sleep Headphones. It functions as a sleep mask, a workout headband, a travel companion, and a call center headset, whereas the SEWOBYE is primarily for water activities.
• Best for battery endurance → SEWOBYE Waterproof MP3. With up to 16 hours of playtime, it lasts slightly longer per charge than the Fulext's 14 hours, though both are sufficient for long days.
I would personally buy the SEWOBYE Waterproof MP3 if my primary goal was for music production or serious athletic training in the water, simply because the ability to carry thousands of high-resolution tracks without a phone and withstand submersion is a unique capability that no other device in this comparison offers. The Fulext is a wonderful gadget for sleep and relaxation, but it is limited by its environment. If I were a swimmer trying to improve my stroke rate or a producer needing a reliable source for ambient sounds while working outdoors near water, the SEWOBYE is the only logical choice. It solves a specific, difficult problem that the Fulext simply ignores. However, if your day is spent mostly indoors or on land, the Fulext offers a level of comfort and convenience that the SEWOBYE cannot match.
Only the SEWOBYE Waterproof MP3 is designed for this. It features an IPX8 rating and is tested for submersion up to 10 feet. The Fulext Sleep Headphones are made of fabric and electronics that will be damaged by water exposure.
No. The SEWOBYE has 8 GB of internal memory that holds over 2,000 songs, so you can operate it independently. You only need a computer to transfer files initially. The Fulext requires a Bluetooth connection to a phone or tablet to play content.
Yes. They feature ultra-thin HD speakers embedded in a soft, breathable fabric headband that lies flat against the ear, preventing the pressure pain often caused by standard earbuds when lying on your side.
The SEWOBYE Waterproof MP3 offers up to 16 hours of playback, while the Fulext Sleep Headphones provide up to 14 hours. Both support fast charging, with the SEWOBYE taking about 1.5 hours and the Fulext taking 1–2 hours to fully charge.
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