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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-02 · 7 min read · Independent comparison
• Koss KSC32i — biggest strength: a complete wired sport headphone with a flexible ear-clip design, soft silicone cushions in three sizes, a sweat-resistant build and an in-line One Touch remote with microphone.
• Koss KSC32i — biggest trade-off: it's a wired 3.5 mm headphone, so it needs a phone or player with a headphone jack, and there's no active noise cancellation of any kind.
• Proof Labs 4 — biggest strength: soft silicone ear hooks that hold AirPods Pro 2nd Generation in place, supplied in two sizes with a storage pouch, carabiner and quick-start guide.
• Proof Labs 4 — biggest trade-off: the hooks must be removed before charging, and they do nothing on their own — no AirPods, no listening.
• Who each pick is for: Koss KSC32i for anyone who wants one ready-to-use pair of over ear hook earbuds for the gym, running or cycling; Proof Labs 4 for AirPods Pro 2 owners whose buds keep working loose.
The KSC32i is the version of the "FitClips" idea that stands entirely on its own. You get the headphones, the cable and the ear cushions in one package. The design is an ear hook — a flexible clip that loops over the ear and holds a lightweight in-ear driver in place — which is exactly the shape people look for when regular bud-style headphones slide out during movement. Koss pairs that clip with soft silicone cushions in three sizes (Small, Medium and Large), so you can actually dial in the seal and the comfort rather than accepting whatever tip happens to be in the box.
On the spec side, this is a 16-ohm dynamic driver with a frequency response of 10 Hz to 20 kHz, which is a wide, full-range figure for a sport headphone — it suggests the tuning is meant to cover the whole audible band rather than just punchy bass. The weight is listed at 1.28 ounces, so it's genuinely light on the ear, and the sweat-resistant rating is the feature that matters most here: this is built for running, biking and gym sessions where moisture is a given, not for a desk.
Then there's the control story, which is where the KSC32i separates itself from a bare set of hooks. The in-line One Touch remote lets you pause, play and skip tracks, activate a voice assistant and answer or end calls, with a built-in microphone for the talking part. Connectivity is a 3.5 mm jack over a wired connection. That's a real advantage for latency and for battery-free listening, and a real limitation if your phone has no headphone jack.
Who should skip it: anyone who has moved entirely to wireless, anyone who wants noise cancellation or isolation from a sealed, noise-blocking design, and anyone who wants to keep using the AirPods they already own rather than buy a second set of headphones.
Proof Labs 4: Who It's For
The Proof Labs 4 is a completely different kind of product, and it's important to be clear about that before comparing the two. This is not a headphone. It's a set of silicone ear hooks and covers made specifically for AirPods Pro 2nd Generation. If you don't own AirPods Pro 2, this product has nothing to offer you.
What it does, it does in a targeted way. The soft, flexible hooks are shaped to wrap around the AirPods Pro 2 and hold them in your ear, addressing the single most common complaint about tiny true-wireless buds: they work loose, especially when you're sweating or moving your jaw. The kit gives you four pairs of hooks in total — two pairs Small and two pairs Large — plus a storage pouch, a carabiner and a quick-start guide. The material is silicone, the color is white, and there's a one-year manufacturer warranty behind it.
Installation is described as easy and hassle-free, with one honest catch spelled out plainly: the hooks must be removed before charging. That's the trade-off of the design. Because the hooks wrap the AirPods, they interfere with the charging case, so your routine becomes: listen, take hooks off, charge, put hooks back on. For some people that's a two-second habit. For others it's the reason the hooks end up in a drawer.
I'd also note what the Proof Labs 4 does not do. It doesn't change the sound of your AirPods, it doesn't add controls, it doesn't add battery, and it doesn't add water resistance. It is purely a fit and retention accessory, and it should be judged on that narrow job.
Who should buy it: AirPods Pro 2 owners who like their earbuds but keep losing the seal during runs, workouts or long calls, and who want a low-effort fix that keeps the earbuds they already paid for.
Side-by-Side: Which Should You Choose?
• Best for a complete, ready-to-use solution → Koss KSC32i. Headphones, cable, cushions and mic all in one purchase.
• Best for AirPods Pro 2 owners who want to keep their existing earbuds → Proof Labs 4. It fixes fit instead of replacing the product.
• Best for sweat and heavy movement → Koss KSC32i. The sweat-resistant build and flexible ear-clip design are made for running, biking and gym work.
• Best for customizable fit → both, in different ways. Koss gives you three silicone cushion sizes; Proof Labs gives you Small and Large hooks, two pairs of each.
• Best for built-in controls and calls → Koss KSC32i. The in-line One Touch remote and microphone handle play, pause, skip, voice assistant and calls.
• Best for people with no headphone jack → Proof Labs 4. The KSC32i is a wired 3.5 mm headphone; the Proof Labs 4 adds no cable at all because it isn't a headphone.
• Best for low-maintenance ownership → Koss KSC32i. No removal step before charging, no risk of losing a small silicone piece.
• Best for travel convenience → Proof Labs 4. The included storage pouch and carabiner are genuinely useful for keeping small hooks together in a bag.
If I had to pick one, I'd buy the Koss KSC32i. It's the only one of the two that is actually a pair of over ear hook earbuds — it arrives complete, it's sweat resistant, it's ultra lightweight, and the in-line One Touch remote makes it usable for calls and track skipping without touching your phone. The Proof Labs 4 is a smart, well-thought-out accessory, and if you already own AirPods Pro 2 and love them, it solves your real problem for less commitment than a new headphone. But as a standalone listening product, it isn't one. In my opinion, the Koss is the safer pick for most shoppers, and the Proof Labs is the specialist pick for a specific owner.
how to wear ear hook earbuds
An ear hook headphone like the Koss KSC32i is worn by looping the flexible clip over the top of your ear so the hook rests behind it, then seating the silicone cushion in your ear canal. Koss includes three cushion sizes (Small, Medium and Large) so you can pick the one that gives you the best fit and audio. The hook carries the weight, which is why the design stays put during movement.
how to put on ear clip earbuds
Start with the correct cushion size fitted to the driver, then bring the clip down over the ear from above and let it settle behind the ear. Adjust the cushion depth until it sits comfortably and seals without pressure. The KSC32i's design is flexible on purpose, so small adjustments are normal and expected.
are ear hook earbuds good
Ear hook earbuds are good when the priority is staying in place during running, biking or gym work, which is exactly what the Koss KSC32i's flexible ear-clip design and sweat-resistant build are aimed at. They're less good if you want a fully sealed, isolating fit or active noise cancellation — the KSC32i lists no noise control. If your goal is retention rather than sound isolation, hooks are a sensible choice.
will the Proof Labs 4 work with my AirPods Pro 2
Yes, that's precisely what it's made for — the Proof Labs 4 is listed as compatible with Apple AirPods Pro 2nd Generation and includes two pairs of Small and two pairs of Large hooks. Just remember the hooks must be removed before charging the AirPods. If you own a different AirPods model, this product is not for you.
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