Spruce Athletic 6 Youth Practice Jerseys, Pinnies, Bibs 100% Polyester for Ages 5-9, 10-15, 16+ Kids measures 18" wide by 21" tall with 9" arm holes and a 7" neck hole. Recommended for ages 5-9. Youth measures 21" wide by 24" tall with 10" arm holes and an 8" neck hole. Recommended for ages 10-15. Adult measures 23" wide by 26" tall with 11" arm holes and a 9" neck hole. Recommended for ages 16+. 100% Polyester. These jerseys are lightweight and very bright. Perfect for practice. These jerseys can be used for any sport or activity.