These headphones are without a doubt the best headphones I have purchased so far in my entire life. I say thus far, because I know that technology is able to continue to become greater and greater as we advance through time, but as of 2023 these headphones are so packed with technology that they meet every need that I could want out of headphones, and additionally have some extra really cool perks.I want to talk first about the number one need that I wanted these headphones to meet. They claimed that they had 100% noise canceling and I can confirm that that is absolutely correct. Closing out the loud outside world is something that is real true need of mine. I live in a major city, and everything is so loud that I can barely concentrate. I can't go to the grocery store, out to eat, for a walk down the road, or sometimes even sit in my own home without having some sort of overpowering noise that I don't want to hear.So here's how these headphones work noise canceling-wise. I'll give you two scenarios.Scenario one, I have had a hard day and had to talk to people all day. I'm hungry, tired, don't want to talk to anyone or hear anyone's voices. I go to my favorite fish restaurant because I'm too tired to cook but I know that I'm going to need some peace and quiet when I get there. I place my food order, then sit down at my table in a very noisy environment with lots of peoples conversations going in the background. Relaxation is just about to begin. I take out my Bose headphones, I insert one into my ear, and then immediately I hear this sound that sounds like a lightsaber. That's the Microphones in the headphones testing the ear seal to make sure sound doesn't get into the headphones. I insert the second headphone into my other ear, and hear another lightsaber like sound. For about two more second I can still hear peoples voices and then all of the sudden I hear a "beep" and everyone's voices fade away! The noise cancelling has kicked in, and it's time for me to enjoy my dinner with some relaxing peaceful music. I'm now sitting in the middle of a restaurant and I can only hear my music and no one's voices at all. Sometimes I'll turn my music off in the middle of the restaurant, and I'll watch funny Instagram videos in the headphones. Usually after a 20 minute meal and some funny videos, I'm so relaxed and happy even after a hard day's work, that I'm ready to go home and go to sleep.Scenario two. I live next to a very busy major street. I can hear lots of road noise, exhaust, loud stereos, and many other kinds of noises. I like to take walks and relax. It's not very relaxing walking when I have to hear a lot of these noises. I insert my bose headphones , and all of the road noises fade away. All I can hear once again is my music. I have to make sure that I stay on the sidewalk when walking, because these headphones cancel out noise so well that if I try to walk on the road, I'll likely get hit by a car because I will not hear the cars driving near me.So that being said, the main thing I love about these is the noise canceling. I mentioned that there were couple cool extra things about these that I wanted to tell you about. I do like the amount of bass that these headphones are able to produce. It's way more than I expected. Additionally the clarity on these headphones is so good that I can can barely describe it in words. There is a treble mode, and a bass mode within the app so I can choose between these two modes and intensify the kind of clarity and or bass that I'd like.The charging case is a medium to small size. It fits well then my pants pocket and doesn't get in the way when I'm in the gym. That's one other thing that I wanted to make sure I told you about, is that these are the perfect headphones for the gym. I've seen several other people in the gym with them on, and now I know why. They don't move around in my ears at all! I work out very intensely, and if headphones were going to move around then they would move around on me. They stay exactly where I put them even though I'm sweating on them non-stop for over an hour each day.I love everything about these headphones. My only regret is that I let the price of these scare me away for so long, and I didn't order them soon enough.