Medium = 20-50 lbs, Small = 13-30 lbs, Large = 22-66 lbs. Swim with Confidence - This swim vest is comfortable and safe, allowing your child to feel relaxed and at ease in the water. Its reliable design helps build your child's confidence in swimming and playing in the water. Child-safe design - Adjustable buckles make it easy for parents to put on and take off their children, but children cannot reach them to remove the vest themselves. Comfortable and easy to wear - No inflation required. Soft armbands are comfortable and breathable, suitable for all-day wear. Unique print - The iconic print design perfectly matches your child's swimsuit. Children must use this under adult supervision as it is not a lifesaving device. Weight: 0.51 lbs (approx. 227 grams).