Fits Xiaomi Mi Band 5. Got the smallest size for my kid. Much easier for her to put on and comfortable to wear all day. She's worn it all day, everyday for the past 2 weeks and no stretching yet. She hardly takes it off, except for charging. It has some room to push it up the arm so it doesn't get wet while washing hands, but it's not loose enough to fall off her hand. Fits perfectly for her.I own a Mi smart band 5. This was a really easy buy since the plastic/rubber mi smart band 5 came with breaks within a year from sweat and heat. I needed something I could use and forget about when I put it on.The first time it came in it was a little hard to push the device into and out of the slot, but thats sorta a good thing, especially if you want it to stay in place. Just remember to clean the platice grooves weekly or so depending on your usage. You would want to go one size smaller. IT WILL STRETCH OUT OVER TIME, so get a size smaller and your gold. Other wise you'll have to bring it up the fore arm to have it tight enough to read your heart rate.Only complaint is that the band could be slightly wider so it doesn't feel as tight the first couple of weeks. It's also not adjustable so keep that in mind. Otherwise a good buy!Love the rainbow pattern, however, after just 2 months of use, it has stretched significantly and I no longer use it. The white plastic around the face also looks dirty, but that's to be expected.Muy buen productoI like this, it's cute and doesn't make my wrist stink like the regular watch bands.However, even though I measured my wrist, the band was loosish on me when I first got it 10 days ago. I figured oh well I'll just push it up a little bit further on my wrist. But it's not working out too well because it works itself back down pretty easily and then the band itself freely spins around my wrist. That's a bit annoying and I believe the looseness is affecting the bands accuracy for sleep data, because it hasn't detected any sleep at all for a couple days, and one day it says I slept for only 2 hours which is not true.I am very careful when taking it off and on since I don't want to stretch it out even further. I've only taken it off and on 4 times to shower since I'm not sure how fast the braided part would dry out of the shower. It HAS already gotten more loose though.Im going to have to return this because the sleep data is the main thing I have the Mi Band for. I do really like it though, so I'm considering reordering in a smaller size, but I'm undecided if I want to chance a different one loosening again.I’m between sizes so I ordered up and I kind a like the bracelety feel but I decided to order a second a size down it’s a little snug still but I love them well enough that I’m happy to have them in both sizes. I look forward to purchasing more colors.UPDATE- Dirt magnet! After wearing this for a few weeks, the white part has has black on it making it look dirty. I tried to clean it with several products (dry erase, goo be gone) but I can not get it clean looking. This dirt came from just doing everyday things and was not from gardening or doing dirty jobs. I really like the colors and wanted this to work but I can not go around wearing something that looks dirty. I am going to try a different band.Since I did not want to spend a small fortune for a fitness tracker, I decided to try the MI5. The black band was not a great look for me. I like this multicolored band as it matches with most outfits. I ordered a size up because I don't like things tight on my wrists. I measured using their chart and was at the higher end of my size. If you want the band snug, I suggest buying according to their chart. I generally don't like watches but I have been able to wear this comfortably. I have been wearing it more than I thought I would.This one sits on my wrist just fine and looks well-made and durable