The X4s are a refresh of the company's older Jaybird X3 wireless headphones. The only significant changes are their improved IPX7 water/sweat proofing, redesigned tips and ‘Speed Cinch' cord management system, which, according to Jaybird, will provide users an even more secure fit.

Solid; comfortable fit; Decent sound for a sports set; Great build quality

Prone to dropouts in busy areas

With an IPX7 water-resistance rating and redesigned wing tips, the successor to Jaybird's X3 wireless earbuds are good-sounding sports earphones prepared for wet weather.

Engaging sound; Firm fit; Useful sound-customization

Some hardness on upper mid treble; Slow-to-respond remote

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...

These headphones are in my opinion the best wireless sport headphones there are. Only problem, and this is the only reason for the missing star, is that they are not grey. They are green. Still it's the sound I wanted

Offering a comfortable fit, outstanding waterproofing. and pleasing, adaptable audio at a reasonable price, the Jaybird X4 wireless sports earphones are a great choice for anyone looking for a new pair of Bluetooth earbuds.

It's early days for me but having tried them out for the first time using the included comply foam tips is that these are very comfortable and securely fitting earbuds with great sound.

Is what it says it is, excellent sound quality.

The Jaybird X4 sports headphones have a lot going for them. They're well-designed and sound good, plus they're pretty good at staying nicely in your ears. The app is a nice touch too - allowing you to customize the frequency response to your preferences.

Photo courtesy of Jaybird If you're in the market for a great pair of wireless sport headphones for working out, getting active, or even for commuting, the Jaybird X4 is an excellent option. I honestly could not come up with any downsides.

Excellent fit; Great sound; Good battery life; Waterproof

The app could use improvement; since you need Spotify Premium to play music through it

In the X4, Jaybird solved some of the biggest issues that people complained about in the company's previous models. With that, we really appreciate Jaybird for listening to their customers' feedback. In fact, there's a lot of improvement in these earbuds.