I ordered these because I suffer from Planter Faciitis and my heels hurt every time I finished going for a walk. Pain free. They stretch from 4 feet to 5. I got the lenses professional changed this made me appreciate them even more. BUYER BEWAREI re-read and although all these look the same, some are made of 95% rayon and others are 95% polyester. Vorher hatte ich ca. Smart thinking on JJMGs part. I now unplug the power cable from the power brick instead of removing it from the trainer (and am very careful). the side straps and toe thong pull out, the soles separate, etc. Ive been looking for something that works well for working remotely in coffee shops and noisy environments, and still being able to hear clients on the phone but also have them hear me clearly without background noises.