Sizing: Baby (6-24 mo.) Head Diameter 19.5-21.5" Lightweight-Packable-Stroller Friendly-Water repellent-Stain Resistant Neck veil for protecting back of neck. UPF 50+ certified sun rating (mesh vents not rated) 2.5" - 4" down sloping brim with floatable foam core (brim length depends on size) Acacia Inc. brings you Sunday Afternoons junior version of their #1 selling hat the Adventure Hat with the same great patented features, now available for kids in the Kid's Play Hat!