buckles provide 5 points and a perfect 40° angles to maintain balance and your baby from tipping over and falling There is foam inside, and middle is fully seal with a waterproofs membranes ( easy to dry Suitable for children from 3 to 24 months The adjustable buckles on the back fit most baby size Easy to adjust Unzip clip and put it on easily You can tighten as need to avoid slipping Helpsmove freely in a comfortable position Outer soft cloth, similar to swimsuit fabric Soft, breathable and elastics