The Swim Safe ABC Swim Jacket, made for Step B: Water Basics, was designed to keep kids safe and comfortable at the same time! The knitted fabric on the outside is smooth and comfy, while the foam pads on the inside will keep them floating on top of the water. Not only has the buoyancy been tested, but they were also designed to have a UPF of 50+ to keep kids safe from the sun?s rays. The adjustable buckle and straps allow you to tighten or loosen the jacket to the perfect size.