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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-23 · 7 min read · Independent comparison
• Sanpyl's biggest strength: a true in-ear seal. Two sizes of silicone earplugs plus a high-elastic back-wound beam and rotating shark-fin anchors mean the buds are designed to lock into the ear and keep water and outside noise out.
• Sanpyl's biggest trade-off: no built-in music storage and a smaller 180mAh battery, so you are tethered to a Bluetooth source and to more frequent charging.
• sunvito's biggest strength: 8GB of onboard storage for up to 2500 songs, so you can swim with no phone anywhere near the pool, plus Bluetooth 5.4 when you want wireless.
• sunvito's biggest trade-off: open-ear bone conduction deliberately leaves your ears unblocked, so you trade the sealed, isolating feel for awareness and comfort.
• Pick Sanpyl if you want sealed in-ear sound, voice prompts and a secure fit for swimming, running and cycling.
• Pick sunvito if you want offline MP3 playback, longer battery life and an open-ear fit for long pool sessions.
The Sanpyl set is an in-ear design through and through. The IPX8 rating is the headline: this is a headphone built to be used in the water without damage, so you can keep music going while you swim rather than leaving the buds on the poolside. Around that core idea, Sanpyl adds a noise-reduction function meant to isolate outside noise, which is as much about clearer calls on land as it is about hearing your music over splashing water.
The fit is where the design thinking shows. A high-elastic soft back-winding beam wraps behind the head, and you get two sizes of silicone earplugs so you can find the seal that actually holds. On top of that, the shark fins rotate along the ear contour until they sit securely, which is the part meant to stop the buds flying out during running, cycling and other sports. It is a silicone build at roughly 55g (about 1.9oz), with a 180mAh lithium-ion battery inside, Bluetooth 5.0, and a 100mA charging current at 4.75–5.75V.
sunvito Bone Conduction Swimming: Who It's For
The sunvito approach is the opposite philosophy. Instead of sealing your ears, the X30 uses a bone conduction driver — a 13mm driver with 8 ohm impedance, 130dB sensitivity and a 20KHz frequency response — to send audio through the bone in front of your ear. Your ear canal stays completely open. For swimming and long training sessions, that means no plugged-up feeling, no pressure build-up, and a lightweight, secure open-ear fit that is meant to stay comfortable over a long session.
The feature that changes how you actually use it is the built-in 8GB of storage. That is room for up to 2500 songs on the headphones themselves, so you can leave the phone in the locker, switch to MP3 mode and get stable underwater playback. When you are out of the water, you flip back to Bluetooth 5.4 for normal wireless listening, with a 10-meter range. Battery life is quoted at up to 8 hours of playtime, recharging magnetically in about 2.5 hours — a charging routine that is much easier to live with poolside than hunting for a tiny port.
Controls are simple push buttons, there is no noise control at all (which is the point of open ear), and the whole thing is a silicone, open-ear, black design for adults, backed by a 24-month warranty. This is the pick for the swimmer who wants music in the water without carrying a source device, or for someone who dislikes things jammed into their ears. Skip it if you want noise isolation, a sealed in-ear seal, or the kind of voice-prompt feedback Sanpyl provides — none of that is part of this design.
Side-by-Side: Which Should You Choose?
• Best for sealed, isolating sound → Sanpyl Swimming Headphones Underwater. The two earplug sizes plus noise-reduction function are built around blocking outside noise.
• Best for swimming with no phone → sunvito Bone Conduction Swimming. 8GB of onboard storage holds up to 2500 songs, so MP3 mode works without any paired device.
• Best for battery life → sunvito Bone Conduction Swimming. Up to 8 hours of playtime versus a 180mAh cell in the Sanpyl.
• Best for long-session comfort → sunvito Bone Conduction Swimming. The open-ear, ear-canal-free design avoids the plugged feeling an in-ear seal creates over a long swim.
• Best for hands-off feedback in the water → Sanpyl Swimming Headphones Underwater. Voice prompts cover pairing, connection, incoming calls and low battery.
• Best for newer wireless → sunvito Bone Conduction Swimming. Bluetooth 5.4 against Bluetooth 5.0 on the Sanpyl.
• Best for a charging routine you won't fumble → sunvito Bone Conduction Swimming. Magnetic charging beats plugging in a cable with wet hands.
In my opinion, the deciding question is whether you want to swim with a phone nearby. If you do, I would buy the Sanpyl Swimming Headphones Underwater — the in-ear seal, two earplug sizes, shark-fin anchors and voice prompts make it the more complete headphone for mixed swimming and dry-land training, and IPX8 covers the water part properly.
If you want to leave the phone in the locker and just swim, I would buy the sunvito Bone Conduction Swimming. The 8GB MP3 mode, up to 8 hours of playtime and magnetic charging solve the two things that actually annoy swimmers: carrying a source and recharging. The open-ear fit is a feature, not a compromise — as long as you don't need isolation.
are headphones waterproof
Not all of them — it depends entirely on the rating. Both headphones here carry an IPX8 waterproof design, which is the level intended for use in water. The Sanpyl sheet states it can be used in the water without damage, and the sunvito sheet describes it as suitable for pool workouts and underwater exercise. If a pair doesn't list an IPX8-style rating, don't assume it can swim.
are headphones water resistant
Water resistant and waterproof are not the same claim. Water resistant usually means splash and sweat protection, while IPX8 — what both of these carry — is the immersion-grade rating. That distinction matters for swimming specifically: sweat and rain are a much lower bar than being submerged during laps. For pool use, look for the IPX8 wording rather than a vague "water resistant" phrase.
It depends on the model. The sunvito Bone Conduction Swimming has 8GB of built-in storage for up to 2500 songs, so you can switch to MP3 mode and swim with no phone at all. The Sanpyl Swimming Headphones Underwater relies on Bluetooth 5.0, so a paired source device needs to be within range. If phone-free swimming is your priority, that single difference settles it.
For comfort over a long session, the sunvito's open-ear bone conduction design keeps your ear canals clear, and its up-to-8-hour playtime means fewer interruptions. The Sanpyl's in-ear seal gives you isolation and a locked-in fit, which suits shorter, more intense sessions and land training. Neither is objectively better — it comes down to whether you value an open ear or a sealed one.
Whichever way you lean, check the current price on Amazon before you commit — the two designs solve genuinely different problems, so the right one is the one that matches how you actually swim.
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See also: Laoziniu Bone Conduction Swimming vs HAOYUYAN Earbuds, LUMINFLY Pillow Speaker Sleep vs Hitarah Bone Conduction Headphones, TECKNET Bone Conduction Headphones vs ZKBSIAXD Earbuds