I use colored Velcro wraps, soft side in, trimmed, a little loose but not enough to slip off the foot.
Since they are adjustable, if they slip off you can put them back on.
The only problem has been that on a handful of occasions, the ducks have gotten the wrap hung up on something they were trying to step over. Exactly how, I cannot say, it's one of those hard to believe moves ducks can make. But no one has suffered injury.
Edited by Amiga - 4/17/16 at 4:21pm