Bought this as I have lost my libre many a times - most recently in a tree obstacle course and snaggled it on carpet while doing pilates. I've worn the arm band with libre and now with my dexcom g6 and both were snug and safe and I felt a lot better about not having them knocked about.
Band was snug and soft. Do measure your arm because what I thought my arm size was compared to actual measurement was different - just so you get the right sizing. Would recommend it to anyone for cgms or pump infusion sites on the arms.