It works, and does cancel the high pitched noises that annoy and distract me the most. Purchased to use with a 29w usb-c for iPhone fast charging. These slides by Corifei are so stylish. If you don?t already have them, I?d suggest multiple sizes as well as varying sizes of hooks. it works but careful what you tread in. I have used it during 4 different cardio sessions and when I took it off there wasnt a single drop of sweat. I ordered the large and they are a perfect size 9-1/2 and not wide. This included 16 peaks over 14,000 feet, and four peaks between 13,900 and 13,999 feet, as well as many other hikes at lower elevation, only some of which were on maintained trails. I also have two pair of the Chase ll tie that are perfect for Tai Chi - flat, supportive, and flexible. I got these for my 1.