Mad Wave's high-quality children's Swim vest has been designed to deliver the safest swim in the pool or at the beach! Made with durable materials, this swim vest will build your child's confidence in the water and help him learn to swim naturally.Size XS: height 36 cm, width 41 cm, suitable for weight less than 20 kg.Size S:height 43 cm, width 46 cm, suitable for weight less than 40 kg.Size M:height 51 cm, width 49 cm, suitable for weight less than 60 kg.