In the photo you can see the blue pair I just bought compared to my old ones I ran in for over a year. 5-7 size and the fit is great. Great design but the foot length was too short. However, the insole is not wide width. At first I had some problems connecting to my phone after pairing the first time, but I think I was holding the button down too long when when powering up. The only down side is they are slightly bulky, but anything smaller would compromise protection. Okay for everyday wear. It’s also quite large (I have a 31” waist for reference) so hard to get ‘tight’. This is definitely made from bamboo, seems sturdy enough. For the price, these are a good pair.