If you want waterproof headphones for swimming and active use, choose H2O Audio Surge S+ Waterproof; if you need wired earbuds with strong noise isolation for flights, choose KZ Duet. For a flight, I’d pick the KZ Duet: its noise-isolating design is the more relevant feature for cutting down cabin distractions, while the Surge S+ is built around water resistance.
H2O Audio Surge S+ Waterproof vs KZ Duet at a Glance
• KZ Duet: Its strongest travel feature is passive noise isolation, with a stated reduction of up to 36 dB; its trade-off is that it is not presented as waterproof.
• Choose the Surge S+ if swimming, heavy perspiration, rain, or water sports are central to how you’ll use your headphones.
• Choose the KZ Duet if you want wired in-ear listening and noise isolation for flights, travel, gaming, or everyday listening.
• For flights, the KZ Duet is my pick; for swimming, the Surge S+ is the clear fit.
The H2O Audio Surge S+ Waterproof is designed for people who need headphones that can handle water. Its IPX8 rating is specified for complete submersion up to 12 feet (3.6 meters), as well as heavy perspiration and rain. That makes swimming and other water-based activities its defining use case, rather than simply an occasional benefit.
It’s also a wired, in-ear design with a short cord, sound-isolating earplugs, and an ergonomic shape intended to sit flush in the ear. The package includes five earplug sizes from XS to XL and a tree-tip set, offering several fit options for active use. H2O Audio lists a one-year warranty. For swimming or water sports, those details make the Surge S+ the more purpose-built choice.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-20 · 6 min read · Independent comparison
I’d skip it if your main goal is a flight earbud. It may be useful for running, cycling, or travel where sweat and rain matter, but its defining advantage is water protection—not the specified noise reduction the KZ Duet offers. It also remains a wired product, so consider whether a cord suits your usual travel setup. If you’re searching for the best open ear headphones for flights, neither of these is open-ear: both sit in the ear.
The KZ Duet is a wired in-ear headphone designed around dual dynamic drivers: a 10 mm driver paired with an 8 mm driver. Its product details describe a sound-isolating fit and passive noise cancellation, with noise reduction stated up to 36 dB. For a flight, that makes it the more directly relevant option when your priority is to reduce surrounding distractions while listening.
The Duet’s angled in-ear fittings are intended to match the ear canal, and two sets of ear-tip sizes are included. It also comes with a USB-C-to-3.5 mm adapter described as having built-in DSP and four EQ settings. That can make it a practical match for a compatible USB-C device, but check your own device and connection needs before packing it. The core headphone connection is wired.
I’d choose the Duet for flights, travel, gaming, or general listening if you want wired earbuds with a noise-isolating design. I’d skip it for swimming or situations where complete submersion is part of the plan: the available product details do not give it a waterproof rating. It may suit someone looking for the best bluetooth earbuds for flights in terms of compact in-ear use, but it is not a Bluetooth model; it is wired.
• Best for flights → KZ Duet. Its stated passive noise isolation is the more useful feature in a cabin, where steady background sound can make listening harder.
• Best for swimming → H2O Audio Surge S+ Waterproof. It is rated IPX8 and specified for submersion up to 12 feet (3.6 meters); the KZ Duet has no stated waterproof rating.
• Best for heavy perspiration and rain → H2O Audio Surge S+ Waterproof. Those conditions are explicitly included in its intended use.
• Best for a travel-focused wired earbud with noise isolation → KZ Duet. It is designed to seal in the ear and reduce outside noise, with up to 36 dB stated.
• Best for fit options during sports → H2O Audio Surge S+ Waterproof. It includes five earplug sizes plus a tree-tip set, giving more listed fit pieces than the Duet’s two sets of ear tips.
• Best for a USB-C connection option → KZ Duet. Its included USB-C-to-3.5 mm adapter with DSP and four EQ settings is a useful feature for compatible devices.
• Best for a short-cord sports setup → H2O Audio Surge S+ Waterproof. The short cord and active-use design are aimed at activities such as swimming, running, and cycling.
• Best open-ear option → Neither. Both are in-ear models; shoppers who specifically want open-ear listening should look at a different design.
If your search is for the best neckband headphones for flights, neither product is described as a neckband. Both are wired in-ear headphones, so this comparison is really about choosing between water protection and noise isolation—not choosing a neckband style.
In my opinion, I’d buy the KZ Duet for flights because its noise-isolating design and included USB-C-to-3.5 mm adapter are more relevant to travel listening than the Surge S+’s waterproofing. The Surge S+ is the better fit if swimming or water sports are the priority, and I would choose it for that job. But for a flight, I’d take the KZ Duet: its stated noise isolation better matches the cabin environment.
FAQ
The available product details do not specify a waterproof rating for the KZ Duet, so I would not choose it for swimming. The H2O Audio Surge S+ is rated IPX8 and specified for submersion up to 12 feet (3.6 meters).
Neither product is described as a Bluetooth headphone in the relevant connection details. Both are wired; the KZ Duet includes a USB-C-to-3.5 mm adapter with DSP and four EQ settings.
Choose the Surge S+ if you need protection from sweat or rain during activity, or the KZ Duet if noise isolation for travel matters more. Both are in-ear wired designs, so your choice comes down to the conditions you need them to handle.
• Redragon H848 vs FOXXRAY HAU-37: Surround Sound Headphones
• Williams AV Sound EAR008 vs Generic Sports Earbuds: Over Ear
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.