Jaybird is back to its old ways with the release of the Jaybird X4. These are some of the best-wired Bluetooth headphones on the market and should definitely be considered by anyone, but especially if you are a frequent gym-goer. The sound is great and the design is familiar, yet comfortable.

From an excellent in-ear fit and waterproof design to a user-friendly app that allows for a bass bonanza or a fairly accurate, flat sound signature, the Jaybird X4 earphones are a notable step forward in the series.

Powerful audio performance that is completely customizable using the app's EQ; Excellent in-ear fit; Waterproof

Short; proprietary charging cable

The X4 is a further refinement of Jaybird's sport earbuds, and both a solid and cheaper alternative to Apple's Powerbeats3.

I'd always used standard ear buds for running previously but these take things to the next level for me. The sound quality is very good and you can customise it to suit how you like it to sound via the app so you have full control over the EQ/soundstage which was brilliant, took a bit of tweaking...

I have only used these headphones for a couple of weeks and very impressed so far. Easy to pair, easy to use, good clean bass, and does not slip out when I sweat.

Jaybird's X series has held a position among our favorite Bluetooth earphones for over five years now. Priced identically to their predecessors at $129.99, the company's new X4 earphones bring some new tricks to the table. The waterproof in-ears feature exclusive-to-Jaybird Comply Ultra foam eartips, redesigned interchangeable eartips and fins, and a new cable cinch management system. If these sound like somewhat incremental upgrades, they are, but when your product is among the best, not every iteration needs to reinvent the wheel. In terms of audio quality, Jaybird's free app offers customizable EQ, so you can lock in whatever sound signature you desire, from pounding bass to austere flat response. The X4 earphones are incredibly versatile, and earn our Editors' Choice for exercise-focused in-ears. Design Available in black, glacier white, or jade, all X4 models feature metallic accents and can be worn over the ear, with the cable behind the neck, or with the cable dropping belo...

The wireless, exercise-focused Jaybird X4 earphones are supremely versatile, delivering booming bass or balanced audio depending on your EQ preferences.

Powerful audio performance that is completely customizable using the app's EQ; Excellent in-ear fit; Waterproof

Short; proprietary charging cable

REVIEW – I'm on a mission to find my next favorite pair of Bluetooth earbuds and so far I've been focusing entirely on truly wireless earbuds, but in reality, if I had to pick a pair of Bluetooth earbuds that sound the best and fit the best, the ones I'd pick are not completely wireless.

Good sound quality

A confession: I gave up on my previous pair of Bluetooth earbuds, Jaybird's own X2, after about a year. It wasn't their fault; they sounded good, they were comfortable, and the battery lasted long enough.

Sound quality The X4 sound really good; There's surprising oomph to the bass, New fins The updated fin style is more flexible and easier to keep clean than previous versions, IP rating They're safe in up to a meter of water for as long as 30 minutes

Goofy proprietary charger I'm more bothered than most by single-purpose cables and adapters, but come on; The charging clip is even worse than the X3's, New cinch A single cinch for adjusting the wire between the earbuds is simpler, but it negatively impacts the fit compared to the double cinch...

If you reside in an area bustling with athletic activity or you often visit the gym, you will realize one thing in common with the runners, weightlifters or strollers. They have headphones on.