Got the 5/6 size for our large 4 year old. He normally wears 5/6 in
sweatshirts and
jackets which fit him spot on. This was a bit on the large size, but still okay. It is nice and lightweight, but seems like it will block the wind and shed water okay and keep him warm. He's not the type to wear a bulky
jacket as it slows him down too much, but he will wear this coat.