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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a pair of earbuds you can actually wear in the water — swimming laps, flip turns and all — choose H2O Audio Surge SX10; if you need wireless workout earbuds with serious noise cancelling, adjustable ear hooks and two full days of battery, choose Anker Soundcore Sport X20. These two look like competitors on a search page, but they solve completely different problems, and picking the wrong one will frustrate you fast.
• H2O Audio Surge SX10 — biggest strength: a true IPX8 waterproof rating with submersion to 12 ft / 3.6 m, plus an over-the-ear short-cord design built specifically for swimming and head-mounted players.
• H2O Audio Surge SX10 — biggest trade-off: it's a wired 3.5 mm headphone with a 1 ft / 30 cm cord, so it needs a physical audio source rather than pairing freely to your phone.
• Anker Soundcore Sport X20 — biggest strength: a genuinely all-day feature set for the gym — adaptive noise cancelling, BassUp with 11 mm dynamic drivers, rotatable/extendable ear hooks, IP68 sealing and 48 hours of total playtime with the case.
• Anker Soundcore Sport X20 — biggest trade-off: its IP68 protection is built for sweat, dust and splashes, not for being submerged the way the Surge SX10 is.
• Who each is for: choose the Surge SX10 if your priority is swimming and water use; choose the Sport X20 if your priority is a wireless, noise-cancelling gym companion with long battery life.
The Surge SX10 is one of the rare earbuds designed around water rather than merely tolerating it. H2O Audio rates it IPX8, the highest waterproof rating, and states it can handle complete submersion down to 12 ft / 3.6 m. That's a different category of protection from the sweat-and-splash resistance most "sport" earbuds advertise. If you swim, this is the entire reason to shortlist it.
The fit is engineered for movement in water. The over-the-ear wire conforms to your ear and holds the earpiece flush, which matters when you're doing flip turns and don't want a bud popping loose mid-length. The cord is deliberately tiny — about 1 ft / 30 cm — to cut down on tangling, and the T-jack guides the wire out of a head-mounted player so the cable doesn't drag or dig into you. H2O Audio also throws in an unusually generous tip selection: memory foam tips in 3 sizes, silicone tips in 5 sizes (XS–XL), and 'tree' tips in 3 sizes, so you can dial in a seal that actually stays put.
On audio, the Surge SX10 uses dynamic drivers tuned for water-sport use, with a frequency range of 20 Hz–20,000 Hz and a bass-forward voicing. The trade-offs are real, though: this is a wired 3.5 mm headphone, so it's meant to pair with a physical audio source — H2O Audio explicitly optimizes it for head-mounted MP3 players — rather than stream freely from your phone over Bluetooth. Skip the Surge SX10 if you want wireless freedom, app-based controls, or noise cancelling for a noisy gym floor; its active noise cancellation and touch media controls are aimed at in-ear listening, not at replacing a fully wireless setup.
The Sport X20 is the opposite approach: it's a fully wireless Bluetooth 5 pair of workout earbuds that tries to solve every gym annoyance at once. The headline is the fit system — ear hooks that rotate up to 30 degrees and extend up to 4 mm, so you can angle and lengthen them until they sit securely on the outer edge of your ear. Anker even builds a Fit Test into the soundcore app to confirm you've seated them correctly, which is a thoughtful touch for anyone who's fought with earbuds that feel fine until the first set of squats.
Active noise cancelling is the second big draw. Anker describes manual and adaptive ANC that turns loud gyms into quieter spaces, muting clanging weights and background chatter. BassUp technology paired with 11 mm dynamic drivers pushes low-end for motivation, and the 20 Hz–20,000 Hz range matches the Surge SX10 on paper. Controls are touch-based with volume control, and there's a proper charging case with a 580 mAh battery.
Side-by-Side: Which Should You Choose?
• Best for swimming and full submersion → H2O Audio Surge SX10. IPX8 and 12 ft / 3.6 m submersion is the deciding spec.
• Best for battery life → Anker Soundcore Sport X20. 12 hours per charge and 48 hours with the case is a huge margin over a wired set.
• Best for noise cancelling → Anker Soundcore Sport X20. Adaptive and manual ANC is a core feature; the Surge SX10 is built for in-ear listening, not gym-floor cancellation.
• Best fit customization for dry workouts → Anker Soundcore Sport X20. Rotatable, extendable ear hooks plus an in-app Fit Test.
• Best tip variety and seal options → H2O Audio Surge SX10. Memory foam, silicone and 'tree' tips across 11 total size options.
• Best for wireless freedom → Anker Soundcore Sport X20. Bluetooth 5 with a 10 m range versus the Surge SX10's 3.5 mm wired connection.
• Best for lifting, running and gym sessions → Anker Soundcore Sport X20. BassUp, ANC and 11 mm drivers are tuned for exactly this.
• Best for head-mounted MP3 players → H2O Audio Surge SX10. The 1 ft / 30 cm cord and T-jack are designed around them.
If I had to pick one for the broadest range of everyday training, I'd buy the Anker Soundcore Sport X20. In my opinion, adaptive ANC, adjustable ear hooks, BassUp bass and 48 hours of case battery make it the more versatile companion for the gym, the road and the trail. But if swimming is your sport, that recommendation flips completely — the Surge SX10's IPX8, 12 ft submersion rating and over-ear short-cord design are things the Sport X20 simply doesn't claim. Match the earbud to your sport and you won't regret either pick.
The Surge SX10. It's rated IPX8 with submersion to 12 ft / 3.6 m and built with an over-ear short cord for swimming. The Sport X20 is IP68 for sweat, dust and splashes — not for swimming.
Yes. It's Bluetooth 5 with a 10 m range and no headphone jack. The Surge SX10, by contrast, is a wired 3.5 mm headphone with a 1 ft / 30 cm cord.
Anker lists 12 hours per charge and 48 hours total with the charging case (580 mAh). The Surge SX10 is wired, so it draws power from your connected player instead.
That depends on your sport, not the spec sheet. For swimming, the Surge SX10's IPX8 rating is the feature you're paying for. For the gym, the Sport X20's ANC, ear hooks and battery are hard to match. Check the current price on Amazon for each before deciding.
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