Ouistiti is French for little monkey. And that's just what the kids will be, in this, the most popular child's harness in the world! For safety, the adjustment buckles are configured to insure a snug fit, but are positioned on the back so the little climbers can't undo them. The full body design provides complete security to hipless kids and provides upright support for comfort and stability. Designed to fit children between ages 5 and 9.