This is a review of the bluedio F2 Faith active noise-cancelling Bluetooth headphone. These headphones are fantastic! They utilize a new technology for Bluedio called Vector flow which will allow air through the back cavity of the headphone. I thought it may just be a gimmick, but it does actually help with pressure; it seems as if the headphones fit more snug and the sound is not suffering from leakage through the headphone itself. These headphones also come with a setting which allows you to turn on Active noise-cancelling technology. I found that pending what you are listening to the active noise-cancelling works really well. If you were going to listen to something at a very high volume the headphones sound great with the technology either turned on or off. I asked my girlfriend to speak to me while using them with both settings and honestly I couldn't hear here with either scenario but I could tell that the sound was much more "clean" with the ANC turned on. I can see the best usage for the noise cancelling technology to be when listening to say a podcast or an audio book anything that requires voice clarity or may not have significant Gain or Volume Output. I will admit that the design of the headphones being an oval as opposed to your typical round circular headset that bluedio has in other devices really does make the headphone feel more secure and sit better on your head. These headphones are extremely light however I did not get the impression that they would move or fall off when doing physical activity. This is now my third set of bluedio headphones and by far my favorite. Not only do they have the best design but they sound the best as well. I love listening to hip-hop and R&B and with my Bluedio T3 the bass was a little too heavy and would drown out the vocals. With the T4 version.... I felt there was a major upgrade in the sound quality but with these they've taken even further steps to enhance clarity, bass , and highs. I haven't listened to a genre of music and felt that I wasn't really immersed. These headphones bump so much that I actually could feel my ears/head vibrating at times... of course not a quality everyone is looking for but it took me back to 1990s Sony Bass, just a 2017 version of that.I love that these come with both a USB C cable for charging as well as a separate USB C to headphone jack connection. The cable quality is very nice as well. Bluetooth works well - I actually used these headphones to make several work calls and those on the other end of the telephone did not know I was speaking to them on Bluetooth. I typically make my calls on a Plantronics headset device and I would say the quality in the call did not suffer at all while using these headphones.These headphones are really well-made and you can tell that they are a premium product they are leaps and bounds above previous iterations of bluedio headphones. I actually had planned to give these headphones to my girlfriend as she loves everything to be white and "aesthetically pleasing" but after opening the package and listening to them, I just can't.... they're too nice and I really want to use them.The only knock on them and serious Bluedio... move away from adding the random branding.The giant FAITH letters on the top of the headset are the only turn off. The bluedio on the side of the phones is fine but not only does the FAITH look kind of corny but it feels like the cheapest part of the set.