We're Number 1! The number one selling Red Sox Kids Hat! Kids navy Red Sox cotton garment washed hat with embroidered "B" on the front and adjustable strap in the back. This is the classic Red Sox hat. All little fans should have one! Generally we say Inf - Newborn to 2 years, Tod - 2 years to 4 years, Kids - 4 years to 6 years, Youth - 6 years to 8 years, 8 years and up should move to adult sized hats. Get the adult version to match!