Bought 2 pair of these for our girls aged 5 and 2.
Both colors, Green and purple. (Green seems to be in demand by the neighborhood hethens er kids)
Simple to use, no parent interaction required, as they change hands. The kids simply push the tab and adjust the strap and off they go.
Leaving the parent to lifeguard duty with whistle, megaphone or bullwhip... or combination of all 3.
At this time really can't find anything wrong with this item, other than I need to order more of them ( A lot more) to silence the squables.
The girls love them along with ALL the other neighborhood kids. And maybe more importantly they are still in 1 piece after 2 weeks of abusive grubby hands.
Would highly recommend for your kids and their friends.
~Secondary note, hanging a sign "Pool Closed" on the front door means nothing to kids that are to small read... and yet the door bell continues to ring.