How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want the better all-round earbuds for workouts and everything around them, choose CMF BY NOTHING Buds Pro 2; if you need the more secure, sweat-focused fit for hard training sessions, choose UPUNAIS Earbuds.
• CMF BY NOTHING Buds Pro 2 — biggest strength: 50dB adaptive hybrid ANC plus a smart dial case, dual drivers with LDAC, and 43 hours of total playtime.
• CMF BY NOTHING Buds Pro 2 — biggest trade-off: It's an in-ear bud with no ear hooks, so fit security during high-impact movement depends entirely on the eartip seal. It's also the heavier, bulkier case of the two.
• UPUNAIS Earbuds — biggest strength: Flexible ear hooks plus an ergonomic in-ear shape built specifically to stay put through running, lifting, and gym sessions.
• UPUNAIS Earbuds — biggest trade-off: Environmental noise cancellation only (no active noise cancellation), and a battery spec that's more modest on paper than the CMF's.
• Who each pick is for: CMF BY NOTHING Buds Pro 2 for someone who wants one pair for workouts, commuting, calls, and gaming with real noise cancelling; UPUNAIS Earbuds for someone who prioritizes a locked-in fit and sweat resistance above all else.
The CMF BY NOTHING Buds Pro 2 is the more feature-dense of the two, and it's the one I'd point most people toward. The headline spec is 50dB adaptive hybrid ANC that automatically detects noise leakage between the bud and your ear canal. That's the kind of design detail that matters in the real world: a bus engine, a gym's ventilation drone, or a plane cabin gets flattened out, and the smart ambient sound recognition keeps you aware of your surroundings when you switch into transparency mode — useful if you run near traffic.
What makes it interesting for training specifically is the smart dial on the charging case. You can adjust volume, skip tracks, and cycle noise modes from the case itself rather than fishing for a touch panel with sweaty fingers. Bluetooth 5.3 with multipoint means you can stay paired to a phone and a laptop at once, and the 120ms low-latency mode is aimed squarely at gaming. Audio hardware is a hybrid setup: an 11mm ultra-bass driver plus a 6mm tweeter, with LDAC support and Dynamic Bass Boost 2.0. That's a genuinely higher-tier configuration than a single-driver design, and it should translate to more separation between low end and detail. Six microphones with Clear Voice Technology 3.0 cover calls.
Battery is the other big number: up to 10 hours on a single charge and 43 hours total with the case, with a 10-minute quick charge giving 3 hours of playback. The IP55 rating means it handles sweat and rain and can take a quick post-swim rinse. A full charge takes about 70 minutes.
Who should buy it: anyone who wants one pair of earbuds that does workouts, commuting, calls, and gaming well, and who values real ANC. Who should skip it: if your priority is a hook-based, glued-to-your-ear fit for sprinting or heavy bag work, the CMF's plain in-ear bud shape won't match that. It's also stated for adults, and the 100g item weight with a 46g case makes it the chunkier package here.
The UPUNAIS Earbuds are designed around one idea: staying in your ears while you move. Flexible ear hooks combined with an ergonomic in-ear shape are the core of the pitch, and the earpiece shape is literally listed as bud, circle, and hook — so you can see the hook is structural, not decorative. If you've ever had a bud pop out mid-set, that's the problem this solves. The enclosure material is silicone, which is a sensible choice for something pressed against skin during sweaty sessions.
Sound comes from 12mm dynamic drivers, which is a larger single driver than either of the CMF's two drivers individually. The result is described as deep bass, clear mids, and crisp highs — a balanced tuning rather than a bass-only one. Calls rely on ENC, or environmental noise cancellation, which suppresses background noise at the microphone end so callers hear you more clearly. That is not the same thing as active noise cancellation for your ears, and it's worth being clear on that: the UPUNAIS reduces noise on your voice for the person on the other end, not noise in your ears.
Battery is rated up to 50 hours with the charging case, and the case has a dual independent LED display so you can see the remaining charge for both the case and the buds at a glance. That's a genuinely handy touch if you're the type to grab buds and go without checking. The specs also list 5 hours of average battery life, which is the per-charge figure, and a 2-hour charge time. IPX4 covers sweat and light splashes — fine for running and gym work, but not for swimming or heavy rain. Bluetooth range is 10 meters, controls include push buttons plus app, call, media, Siri, and voice control, and it carries a 1-year manufacturer warranty.
Who should buy it: runners, lifters, and anyone doing high-movement training who wants a fit they don't have to think about. Who should skip it: if you want active noise cancelling for flights or a noisy commute, or you care about lossless codecs and multipoint, this isn't the pick.
• Best for noise cancelling → CMF BY NOTHING Buds Pro 2. 50dB adaptive hybrid ANC versus environmental noise cancellation on the UPUNAIS.
• Best for secure fit during hard training → UPUNAIS Earbuds. Flexible ear hooks and a hook-shaped earpiece are built for movement.
• Best for battery life → UPUNAIS Earbuds on total figure (up to 50 hours), CMF BY NOTHING Buds Pro 2 on single-charge stamina. The CMF gives up to 10 hours per charge and 43 hours total; the UPUNAIS lists up to 50 hours with the case but 5 hours average per charge.
• Best for audio hardware and codecs → CMF BY NOTHING Buds Pro 2. Hybrid dual drivers, LDAC, and Dynamic Bass Boost 2.0.
• Best for call clarity → CMF BY NOTHING Buds Pro 2. Six HD mics with Clear Voice Technology 3.0, versus ENC on the UPUNAIS.
• Best for high-impact workout fit → UPUNAIS Earbuds. Silicone construction and ear hooks suit sweat-heavy sessions; IPX4 covers sweat and light splashes.
• Best for all-day versatility → CMF BY NOTHING Buds Pro 2. Multipoint Bluetooth 5.3, 120ms low latency for gaming, smart dial case, IP55 with a post-swim rinse.
• Best for battery visibility → UPUNAIS Earbuds. The dual independent LED display shows case and bud levels separately.
In my opinion, the CMF BY NOTHING Buds Pro 2 is the pair I'd buy. It covers more ground: real adaptive noise cancelling, hybrid drivers with LDAC, six mics for calls, multipoint, a low-latency mode, and a smart dial case you can operate without touching your ears. For most people who train a few times a week but also commute, take calls, and game, it's the more complete tool.
I'd only steer you to the UPUNAIS Earbuds if fit security is your single biggest complaint with earbuds and you don't need active noise cancelling. The ear hooks and silicone build are purpose-built for movement, and the LED battery display is a nice practical touch. That's a narrower brief, but for the right person it's the better answer. Either way, check the current price on Amazon before deciding.
FAQ
how to workout with wired earbuds
how to wear sport earbuds
Seat the bud in your ear canal and rotate it slightly so the tip seals, then route any hook over the top of your ear. The UPUNAIS has flexible ear hooks for exactly this; the CMF BY NOTHING Buds Pro 2 has no hook, so eartip selection and seal do the work.
how to reset fitness earbuds raycon
That's specific to Raycon models, and neither product here is a Raycon. For these two, both use touch or push-button controls and app-based control on the CMF, so check each brand's manual for its own reset procedure — neither data sheet lists a reset method.
what is the best workout earbuds
There's no single answer. In my opinion, the CMF BY NOTHING Buds Pro 2 is the better workout pick if you also want ANC, LDAC audio, and 43 hours total; the UPUNAIS Earbuds is the better pick if a secure ear-hook fit and IPX4 sweat resistance are what you need most.
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.
See also: CMF BY NOTHING Buds 2 vs EarFun Air Pro 4, CMF BY NOTHING Buds 2 vs Baseus Bass BP1, Samsung Galaxy Buds Pro vs MoBadeety Earbuds