The Polo Ralph Lauren Kids Rash Guard Top in blue is a stylish and practical choice for a 4-year-old boy. Made by the well-known brand Polo Ralph Lauren, this top is designed specifically for boys and comes in a regular size fit. With its character detailing and age-appropriate sizing, this top is perfect for keeping your little one safe and comfortable during swim time. The blue colour adds a fun and vibrant touch to your child's wardrobe, making it a great addition for any young boy's collection.