Our distinctive & unique hats provide ample shade and 4" of stretch in the band. Not rain / wind resistant. Lightweight, breathable, comfortable, packable. CARE: Cool wash, no bleach, air dry/tumble dry low. Medium steam iron. SMALL: 3 - 12 mos (15" - 19"). MED: 9 mos - 4/5T (18.5" - 22"). LARGE: youth - adult (21" - 24")