Reversible satin bonnet that can be worn on either side! Keeps hair from drying, frizzing, and breaking while also holding in moisture during sleep! • Baby: 10” Bonnet diameter, 15” elastic (unstretched) • Small: 11.5” Bonnet diameter, 18” elastic (unstretched) • Medium: 13” Bonnet diameter, 21” elastic (unstretched) • Large: 15” Bonnet diameter, 21” elastic (unstretched) • Extra Large: 16.5” Bonnet diameter, 21” elastic (unstretched)