If you want a dedicated, skin-friendly tool built specifically for the unique physics of swimming with zero reliance on Bluetooth underwater, choose MARLALL Soft Liquid Silicone; if you need a versatile hybrid that bridges high-fidelity Bluetooth streaming with MP3 storage for both land and water, choose Monster Open Ear BC300.
This is not a question of which device is objectively superior in every metric, but rather which one aligns with your specific routine. Both units are engineered to keep your ears open while delivering audio, a necessity for anyone trying to maintain situational awareness while moving. However, the implementation details diverge significantly enough that buying the wrong one could leave you frustrated during your next workout or library session. The MARLALL model leans heavily into a singular, highly specialized design philosophy focused on the aquatic environment, utilizing materials that prioritize comfort against the skin during prolonged submersion. In contrast, the Monster unit positions itself as a dual-purpose powerhouse, leveraging newer connectivity standards to offer flexibility whether you are running a lap or commuting through a quiet study space.
• MARLALL Soft Liquid Silicone: Its biggest strength is the ultra-soft liquid silicone construction designed for maximum comfort and a secure seal during intense water sports, but it trades off versatility by requiring you to rely solely on its internal 32GB storage when submerged since Bluetooth does not work underwater. This pick is for the serious swimmer who prioritizes material softness and waterproof integrity over wireless convenience.
• Monster Open Ear BC300: Its biggest strength is the combination of Bluetooth 6.0 for wireless streaming and 32GB onboard storage for offline listening, offering a seamless transition between dry and wet activities, though it uses a plastic and silicone mix that feels slightly less "skin-friendly" than the competitor's pure silicone approach. This pick is for the multi-sport athlete or commuter who needs one device to handle everything from pool laps to library study sessions without changing gear.
The MARLALL Soft Liquid Silicone headphone is an exercise in material science tailored for those who spend significant time in the water. The defining characteristic here is the use of skin-friendly liquid silicone for the entire overmold. Unlike many competitors that might use hard plastics or standard rubber blends for the ear hooks, this device wraps around your head in a way that distributes pressure evenly. For someone spending hours training in a pool, this matters. The ergonomic design ensures the headphones do not slip or shift, even during vigorous flip turns or underwater dives. The weight is listed at just 22.68 grams, making it nearly imperceptible on your face once settled.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-28 · 8 min read · Independent comparison
You should buy this if your primary goal is to have a dedicated swimming companion that feels like part of your gear rather than an accessory you are forced to wear. The IPX8 rating is not just a marketing buzzword here; it is a functional requirement for the device to operate. You can take this deep into the water for snorkeling or surfing without fear. The 32GB internal storage allows you to load up your favorite playlists directly onto the device, bypassing the phone entirely. While Bluetooth is present, it is strictly for dry use; underwater, the physics of water blocks the signal, so the MP3 mode is your only option. If you are looking for lightweight bone conduction headphones for library use, this works, but it is over-engineered for that specific setting compared to a simpler model.
However, you should skip this if you expect to stream music from your phone while swimming. There is no workaround for the fact that Bluetooth waves cannot penetrate water effectively. You must transfer your files via computer to the magnetic charging port before you hit the pool. Additionally, if you are sensitive to the feeling of any device on your ears, the open-ear design is excellent for safety, but the focus on a "no buds" experience means you will still hear the water around you. This is a single-task machine: it is designed to be your swim partner first and everything else second. The battery life of 7 hours is sufficient for a full day of training, but the lack of advanced connectivity features makes it less appealing for general daily use outside the pool.
The Monster Open Ear BC300 is built for the person who refuses to compromise between their land-based activities and their aquatic ones. It integrates Bluetooth 6.0, which offers a robust connection range of up to 33 feet, allowing you to listen to podcasts or music from your phone while jogging, cycling, or sitting in a coffee shop. This version of the device understands that modern users rarely want to carry two separate pairs of headphones. The inclusion of 32GB of internal storage provides a backup plan for when you leave your phone behind or enter a zone where wireless signals are spotty. This feature set makes it an ideal choice for sports earbuds for library environments where you might need to switch quickly between a silent playlist and ambient sound monitoring.
Its design incorporates a flexible memory frame combined with soft silicone ear hooks. This hybrid construction allows for an adjustable fit that can accommodate different head sizes, including smaller frames. The product description notes that it can be reshaped gently to ensure a secure lock during high-intensity activities. Like the MARLALL, it carries an IPX8 waterproof rating, meaning it can withstand submersion up to two meters deep for two hours. This certification covers sweat resistance and accidental splashes, but it also permits actual swimming when switched to MP3 mode. The battery life here is notably higher, offering up to 10 hours of continuous playback, which is a significant advantage for long-distance runners or those who train for extended periods without access to a charger.
You should buy this if you value versatility and want a device that handles Bluetooth streaming with ease. The ability to organize music into folders and utilize shuffle modes directly on the device adds a layer of usability that enhances the user experience beyond simple playback. The corrosion-resistant charging contacts and magnetic cable system mean you won't have to worry about rust or port damage after repeated exposure to chlorine or saltwater. However, the enclosure material includes plastic alongside silicone, which might feel slightly less premium or soft against the skin compared to the all-liquid silicone approach of the MARLALL. If you are someone who moves from the gym to the library to the pool in a single day, this is the more pragmatic choice. It balances performance across all environments rather than excelling in just one.
• Best for swimming immersion: MARLALL Soft Liquid Silicone, due to its specialized liquid silicone construction designed specifically for comfort during extended submersion and rigorous water sports.
• Best for wireless connectivity: Monster Open Ear BC300, thanks to its Bluetooth 6.0 support which allows for stable, long-range streaming from your phone while on land.
• Best for battery endurance: Monster Open Ear BC300, offering 10 hours of playtime compared to the 7 hours provided by the MARLALL model.
• Best for comfort on small heads: Monster Open Ear BC300, featuring a flexible memory frame that can be manually adjusted to fit various head sizes securely.
• Best for material softness: MARLALL Soft Liquid Silicone, utilizing an all-overmold liquid silicone that is explicitly marketed as skin-friendly and ultra-soft.
• Best for file management: Monster Open Ear BC300, which supports folder organization, shuffle modes, and remembers playback positions directly on the device.
• Best for charging speed: Monster Open Ear BC300, reaching a full charge in approximately 2 hours versus the 1.5 hours required for the MARLALL (though both are quick).
• Best for library silence: Monster Open Ear BC300, as its Bluetooth capabilities allow for easy switching between devices and its 10-hour battery ensures you won't run out of power during long study sessions.
After weighing the specifications and intended use cases, I would personally buy the Monster Open Ear BC300. While the MARLALL Soft Liquid Silicone is an impressive piece of engineering for the pool, its limitations outside of water make it a niche tool. The Monster unit offers a broader utility curve; the Bluetooth 6.0 connectivity and 10-hour battery life make it far more practical for daily life, including those critical moments when you need lightweight bone conduction headphones for library study or casual walking. The ability to seamlessly switch between wireless streaming and offline MP3 mode gives me the freedom to move without worrying about my phone or battery status. In my opinion, the Monster Open Ear BC300 is the better investment for a lifestyle that spans multiple environments, whereas the MARLALL is best reserved for those whose primary activity is exclusively swimming.
Yes, both models feature open-ear designs that allow you to hear your surroundings, making them safe and appropriate for library use. The Monster Open Ear BC300 is particularly well-suited for this due to its longer battery life and Bluetooth connectivity for easy streaming from your phone.
Both units are IPX8 waterproof and can be submerged, but they require you to switch to MP3 mode because Bluetooth signals do not transmit effectively through water. You must load music onto the internal 32GB storage beforehand to listen while swimming.
The Monster Open Ear BC300 offers a longer battery life with up to 10 hours of continuous playback, compared to the 7 hours provided by the MARLALL Soft Liquid Silicone.
Yes, both devices come with magnetic charging cables and corrosion-resistant contacts designed to withstand regular exposure to pool water, chlorine, and saltwater without rusting or degrading.
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