Outerstuff New England Patriots Youth Flex Performance Hoodie - Navy 100% Polyester Screen Printed Graphics Officially Licensed Made by Outerstuff Size 8 armpit to armpit is 16.5" and collar to bottom is 19", Size 10/12 armpit to armpit is 18" and collar to bottom is 21 1/2", Size 18 armpit to armpit is 21 1/2" and collar to bottom is 25".