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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want to upgrade the earbuds you already own with a deeper, more secure seal and better bass, choose COMPLY Memory Foam Replacement; if you need a complete pair of tiny, ultra-light wireless earbuds built specifically for sleeping on your side, choose SZHTFX Sleep Earbuds. These two products solve completely different problems, and the right pick comes down to one simple question: are you fixing your current earbuds, or replacing the whole setup?
• COMPLY Memory Foam Replacement — biggest strength: Body-heat activated memory foam that molds to your ear for a secure, noise-isolating fit, plus a six-tip kit with a clamshell case.
• COMPLY Memory Foam Replacement — biggest trade-off: These are replacement tips, not earbuds. You need compatible earphones already, and compatibility is limited to specific models.
• SZHTFX Sleep Earbuds — biggest strength: A complete wireless earbud set weighing just 2.1 grams per ear, designed around side sleepers, with up to 30 hours of total use from the charging case.
• SZHTFX Sleep Earbuds — biggest trade-off: A single 3-hour battery life per charge and a fit philosophy that prioritizes deep insertion and sleep comfort over everyday versatility.
• Who COMPLY is for: Anyone who already owns compatible earbuds and wants a better seal, more grip, and richer sound.
• Who SZHTFX is for: Side sleepers and light sleepers who want a discreet, featherweight pair of earbuds for music, calls, and blocking out snoring.
The COMPLY Memory Foam Replacement is a three-pair set of medium memory foam ear tips in black, made from Comply True Memory Foam. The core idea is simple: silicone tips sit on the surface of your ear canal, while memory foam expands to fill it. Because the foam is activated by your body heat, it molds to the exact shape of your ear over a minute or two of wear. That custom fit is the whole point, and it's why this product exists in the first place.
There are two things to be honest about. First, this is a replacement part, not a product that works on its own. The listing is built around compatibility with specific earphones, including Powerbeats Pro, Powerbeats, and Flex, and it's explicitly not compatible with Beats Studio Buds. If your earbuds aren't on that list, this isn't your product. Second, memory foam is a wear item. Comply's own care guidance says to clean the tips gently with warm water and a soft cloth, and to avoid alcohol-based cleaners or lotions because they degrade the material. That tells you these tips have a lifespan, so plan on replacing them periodically. If you want a set-it-and-forget-it accessory, silicone is more forgiving.
Skip it if: you don't own compatible earphones, you want a complete wireless solution, or you dislike the idea of periodically replacing a consumable part.
SZHTFX Sleep Earbuds: Who It's For
The SZHTFX Sleep Earbuds are a different animal entirely. This is a full wireless earbud set in a nude color, built from silicone and designed from the ground up around one use case: sleeping, especially on your side. Each earbud weighs only 2.1 grams, which is remarkably light, and the whole design brief is about minimizing the pressure on your ear so that rolling over at night doesn't turn into a stab of pain. That's a genuinely different design goal than a gym or commute earbud, and it shows in the specs.
The fit is canal-type, meaning the earpieces insert deep into your ear like earplugs. That deep insertion delivers two benefits: excellent sealing for bass reproduction, and reduced sound leakage so the person next to you hears less of your audio. SZHTFX rates the noise suppression at up to 24dB, which is enough to meaningfully soften ambient noise, snoring, and the general hum of a bedroom. There's also a small but thoughtful detail worth calling out: the low-battery beeping is eliminated, so you won't get woken up by a chirp at 3 a.m.
On connectivity, both earbuds have built-in main connectors for a more stable link, and each one can connect to a separate device at the same time. After the first pairing, pulling them out auto-connects to Bluetooth. The audio hardware is a dynamic driver with a 20Hz–20,000Hz range and 32 ohm impedance, and the Bluetooth version is 5. Battery is the clear trade-off: about 3 hours per charge, extended to roughly 30 hours of total use via the 300mAh charging case, which recharges them several times over. For a night of sleep, 3 hours per charge is short unless you're fine rotating them through the case.
Skip it if: you need all-day battery for work or long commutes, or you want a premium everyday earbud rather than a sleep specialist.
• Best for fixing earbuds you already own → COMPLY Memory Foam Replacement. It upgrades seal, grip, and bass without buying new earphones.
• Best for side sleepers → SZHTFX Sleep Earbuds. At 2.1 grams per ear with a sleep-first shape, this is the design intent.
• Best for noise blocking while sleeping → SZHTFX Sleep Earbuds. Canal-type deep insertion plus up to 24dB of noise suppression.
• Best for workout grip → COMPLY Memory Foam Replacement. Memory foam holds better than silicone and resists slipping during runs and lifts.
• Best for total battery life → SZHTFX Sleep Earbuds. Around 30 hours of cumulative use from the charging case, versus none at all for a set of tips.
• Best for a complete wireless setup → SZHTFX Sleep Earbuds. It's a full Bluetooth pair; the COMPLY kit is only the tips.
• Best for discreet, low-leakage listening → SZHTFX Sleep Earbuds. Deep insertion cuts sound leakage so your audio stays yours.
• Best for long-term durability expectations → COMPLY Memory Foam Replacement. Foam is a consumable you'll replace over time; that's the trade for the custom fit.
If I had to pick one, I'd choose the COMPLY Memory Foam Replacement — but only if you already own compatible earphones. In my opinion, the body-heat molding, the stronger grip than silicone, and the noise-isolating seal deliver the most improvement per dollar for someone who likes their current buds but wants them to fit and sound better. That said, if your actual problem is that you can't sleep comfortably in earbuds, the COMPLY tips won't solve it. In that case, buy the SZHTFX Sleep Earbuds — they're purpose-built for side sleepers, and that's a problem only a complete, ultra-light wireless pair can fix. Check the current price on Amazon before you decide.
FAQ
That's exactly what they're designed for. Each earbud weighs 2.1 grams, and the shape is built to minimize pressure so rolling over at night is less likely to hurt your ear.
About 3 hours per charge, with roughly 30 hours of total use from the 300mAh charging case, which recharges them several times. For a full night, expect to cycle them through the case.
Both aim at isolation, but differently. The COMPLY tips rely on a memory foam seal that expands in your ear, while the SZHTFX earbuds use deep canal insertion with up to 24dB of noise suppression. For sleep-specific noise like snoring, the SZHTFX approach is the more targeted one.
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