I purchased them because I have concrete floors. Theyve improved the ankle support as well, its much stronger, and a shiny patent leather look added, too. So, if you want something NOT for fashion purposes and for ACTUAL WAIST TRAINING EXERCISE PURPOSES and POSTURE TRAINING/SUPPORT, GET THIS. they are super comfortable. These are high quality headphones, but I only give it 4 stars because Im not sure the quality justifies the price. When put together and heavily loaded this unit is extremely stable 👍 These are fantastic and the sound quality is amazing the bass is good and when I have them in you could scream at me and I will not here you. Quality materials, comfortable and make my headphones usable over longer periods of time. I basically go with the smallest size and they do fit snugly and feel comfortably secured in my ears. I lost my Bose QC20 headphones on the plane.