Youth measures 21 wide by 24 tall with 10 arm holes and an 8 neck hole. Recommended for ages 10-15 Kids measures 18 wide by 21 tall with 9 arm holes and a 7 neck hole. Recommended for ages 5-9. 100% Polyester These jerseys are lightweight and very bright. Perfect for practice. These jerseys can be used for any sport or activity.