WHAT NICE SET! First of all, they are packaged very nicely. Yout turn the top then lift the case to open the package and find a beautiful set of goggles. The goggles are smart looking, but best of all is the way they adjust and the fastener in the back! These have a push button fastener in the back. On each side of the fastener, there is a place to adjust the size. You just slide the "stay" down the strap out of the way, Push another button to release the strap, slide it out to the length you want, and then slide the "stay" back into place. These also have built in ear plugs which my grand kids love. I need about 3 more sets like these! NICE