When my children were smaller we never went to the pool or the lake without their Dark Lightning Water Wings. The wings have a chest vest that is adjustable to make sure it is snug around your little ones and arm wings that sit on their upper arms. The arm wings are attached to the chest vest so you don't need to worry about the wings slipping off their arms. The water wings made swimming safe and fun for all of us. They come in lots of fun and colorful patterns!