Gro-With-Me: Drawstring head adjustment & adjustable chinstrap ensure perfect fit and longer use Superior Sun Protection: 50+ UPF breathable cotton and wide brim strengthened to stay up in front. Stay-on: Chin-strap ensures hat stays put when windy or child pulls Safe: Break-away safety clip on the chin-strap Pack-able: Light weight and easily foldable to fit in a pocket for easy storage and travelCotton Floppy Hat Sizing: S: 0 6 months, head up to 45cm (17.5) with 5.0 cm wide brim M: 6 24 months, head up to 50cm (19.5) with 6.0 cm wide brim L: 2 5 years, head up to 53cm (21) with 6.5 cm wide brim XL: 5 12 years, head up to 56cm (22) with 7.0 cm wide brimJan & Jul Gro-With-Me Baby Toddler Kids Girls Boys Cotton Floppy Sun Hat grows with your child so you can use it longer. Designed by savvy Vancouver moms, every hat is guaranteed to fit your child with a fully adjustable head drawstring and an adjustable chinstrap.