These reflective ankle bands will. not. slip. down. I guarantee it. I've had mine for years and years. They weren't selling them as hi-viz safety items then, it was purely for keeping your pants cuffs out of your chainring. But they were reflective out the gate. Most ankle bands say they are elastic, these really are! That is the secret to them staying up. Pull them snug before engaging the hook and loop (Velcro) closure. Off you go. Recommended.