Update - 03/27/2016:Looking at the other reviews on this product, I noticed most of the positive ones were given this product for free/discount. I paid full price, and this is my true opinion. Don't ever believe people who are bought by a company. To state you are writing your honest opinion, but neglecting the horrendous sound, is unbelievable. Rant over. On to the original review:__________Let me start by saying that I have been a faithful JLab customer since the beginning. The reason why is because I am an audiophile on a budget. I own the JLab Omni's, and Bombora's (the former of which, are incredible headphones). I'll be honest in saying, I was hoping this product would be a revamped and upgraded version of the Bombora (which sounded awful, and was bulky). It appears to me like Jlab only fixed the 'bulky' aspect of the Bombora, while remaining the same, and possibly worse, on the audio quality.___________________Let me start with what the purpose of headphones are for: sound quality. I am testing with an HTC One M9 (which has been regarded by many tests, as the best smart phone for audio quality, to date), and music files of 320 kbps quality. I use Viper4Android to add natural bass to the sound profile (which I do on all headphones/earphones).Positives with audio:- For songs with a single instrument (eg. a violin/piano solo), the highs are impeccable. Very detailed.That's it for positives. Yes, I know. Things look bleak. Probably because they are.Negatives with audio:- Highs: Songs with mutliple instruments in the high spectrum (eg. an orchestra, band, etc): The audio becomes VERY muddied. The audio clashes more than the original speakers in my '02 Honda (which sound awful as well). Also, as with old JLab products, the highs are very 'bright' (or very loud over other spectrums).- Mids... What are mids? You won't find or hear any with these headphones. Cello's want to make me cry, Piano's want to make me vomit. "These are not the mids you are looking for" is what someone on the production line said, as they ran off with all the mids.- Lows: There is bass. I'm almost positively certain that there is a hint of suspicion that they exist in these headphones. All kidding aside, there is bass. However, to actually hear it, you have to press the headphones firmly against your ears. Even then, the bass sounds out of place, and often clips at certain ranges (That's right, I'm looking at you Hip Hop/Rap).I used Adagio for Strings op 11a to test certain parts of these. The beginning of the song actually sounds good...That is, until other instruments come into play. Than it's just cringing till the song is done. I tested on some other genres (such as rap and rock), however, I couldn't bear it long enough to go into detail of each genre. That bad hasn't happened for some time.*phew*. Glad we got that part of the review over. It hurt to recall the painful experiences. If you are looking for anything with good audio quality, look elsewhere (such as the Omni's).___________________Now for the somewhat less painful part: design.Positives:- The cable is very nice, and the mic/track control piece feels well built (not just cheap plastic, like previous JLab designs).- The Eco Leather almost seems like real leather. It's nice and soft.- The Cloud Foam Cushions are so comfortable. It's practically like having pillows on your ears.- I LOVE the folding function. Very handy when you want to transport these headphones.- The carrying case is good for transporting/protecting the Flex's. It has the added feature of a compartment to hold the 3.5mm cable.Negatives:- When wearing these, there is a bit of open space at the bottom, under the ear, which breaks the 'seal', thus losing some bass quality (as previously mentioned).___________________It seems to me like the JLab Flex, is a step backwards for JLab, which is the first in quite a bit (2 years, if I recall). As a long time fan of JLab, I am extremely disappointed that they would put out such a product, that is sub-par. When I asked them the difference between the Flex, and the Omni, this is what JLab said: "Where Flex, as a studio headphone, focuses on vocal clarity with an abundance of bass and sub bass, OMNI has an overall balanced sound with clear treble and mid-range, but also has an emphasis on bass and sub-bass." Vocal clarity: yes. Everything else? no. If the Flex's bass is what the product is focused on, than the company failed sorely.All in all: these are comfortable headphones, for sure. However, if you have any love for music and/or sound quality, you will look for something better (I recommend the Omni's). I'll update the review if my thoughts change at all, but I doubt that's going to happen.These JLab Flex headphones are great, sounding better than their price point would have you believe. They fold up to a decently small size making them quite portable. I do wish the included case was a hard case just to keep them better protected when you throw them into your backpack. They've got a stylish design and premium build quality. The metal band seems really strong when stretched or twisted. The detachable cable is a plus. The bass is prominent and hits cleanly, not muddy at all. The mids are recessed a bit but can be EQ'ed without any issues. The highs are forward, but seem to lack just a bit of clarity. These don't require an amp to sound good and loud on portable devices, but perform well should you want to amp them. The only reason I knocked a star off on these is that they are listed as Over Ear headphones and unless you have the ears of a newborn, these are definitely On Ear headphones. They are really comfortable on ears though, I can wear them for about 2 hours before my ears start to get sore. All in all, if you're looking for a great sounding portable on-ear set of headphones that can take some abuse and keep right on playing, you'd be hard pressed to find a better pair than the JLab Flex.Great headset, loud once its cranked up, feels good on walks, cant really complain beside l want them a bit louder. I have had JLab Epic 2 for about almost 2 years and they are the loudest blutooth bud lve ever had ever. Without lossing it sound quality. These feel and sound just as good but not as loud as the Epic 2s.(Update) the headphone port no longer works and no sound is coming out. No update on warranty either.I ordered the wrong pair thinking these had bluetooth based on a link but it isnt a problem with me. I love them so far! though they are rather loud and at times you can hear them so i keep them at a low volume. You can practically use them as portable speakers when turned up all the way. The design is rather nice and comfortable. The option that they fold up is simply awesome! Ill have to see how these do when working out next.I found these to be totally lacking in bass. This was odd as the specs list them down to 20 hz, a very low end. They are beautifully constructed and fit very well. The main reason I purchased them in fact, was for their ear cup size. However, due to the sound, I returned them.Headphones work very well, with good frequency response for classical music, and the ear cups are comfortable for long periods (1-4 hours). They fold nicely and come in a durable case. They also isolate sound nicely and serve well when I'm flying both as headphones and ear muffs for sleeping.when I ordered these I was excited to try them out, I was surprised to find that not only did they not cancel much noise, but the plastic in them is cheap and brittle, already 3 weeks after purchase and the covers are cracked. this could of been a great pair of headphones if they used good build materials. it looks like they cheaped out on these, sad to see.They are very nice a decent balance of bass and midrange, one is not overpowering the other, they are real comfortable over the ear headphones. Great work guys!