Our distinctive, reversible sun hats provide  are perfect for year-round sun protection & travel! Hidden elastic for comfort & growth. SM: 3 - 12 mos (15" - 19") MED: 9 mos - 4/6 yrs(18.5" - 22") LG: youth/adult (21" - 24") Cool wash, no bleach, air dry/tumble dry low.