Product Description Cotton shell with terry sweat band - Terry elastic in back with ties for snug fit - Baby can't pull it off like other hats - Store in any bag or stroller pocket - Provides sun protection for neck and head - Soaked in cool water provides instant heat relief - Machine Washable - Baby Do Wrap Circumference: 17"" Not Stretched - Loose Fit, 19"" Comfortable Fit, 23"" Completely Stretched - Too Tight!