HIGH-QUALITY MATERIAL: Made of 25mm EPE (Expandable Polyethylene) padding, which can perform a good buoyancy. Designed for kids weighing 37 to 50 pounds (M Size) / 50 to 90 pounds (L Size), great for swimming beginners. BRIGHT COLOR MAKES MORE VISIBLE: Come with highly visible color, essential for finding your children quickly. With so cute whale pattern to attract your kids, it is difficult for kids to refuse to wear the life vest. COMFORTABLE & SAFE: It is light weight and allows for plenty of arm movement. You can adjust it to snug your kids well and it will not pop up over their head. They will feel more confident, secure and safe in the water at all times. EASY TO WEAR & SURVIVAL WHISTLE: Designed with zipper closure and quick-release buckles with adjustable straps, your children are able to put them on by themselves with little assistance. Package includes a survival whistle and a whistle pocket, kids can use it when something unexpected occurs to them. NOTE: Please dry the Life Jacket before put it away. DO NOT expose the life jacket to the sun. Children should swim under adult supervision.