Boston Red Sox Kids clean up style red hat. Kids Red Sox 100% cotton red garment washed cap with a navy embroidered "B" on the front and a cloth adjustable strap in the back. 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!