UPF 50+ Fabric: Made with premium polyester fabric, breathable, durable adn skin friendly. UPF 50+ sun protection blocks 98% of UV Rays Sun Protection: 6.6cm/2.6" foldable floppy wide brim will help shield your kids' skin and offer extra protection One Size: Best fit for head circumference: 50cm-54cm (19.7"-21.3"), one size fits most children aged 2-6 Adjustable: The non-scratch hook and loop fastener chin strap securely holds the hat in place, while an elastic drawcord with a toggle at the back allows for adjustability Breathable & Packable: The mesh side vents provide superior airflow, while the moisture-wicking sweatband keeps kids cool and comfortable. It's packable for easy on-the-go use