What is the fine-grained topic of the following text: To learn more about AATCC testing, go to www.aatcc.org Brim span: 3" S/M= 6 3/4", 6 7/8", 7", 7 1/8" M/L= 7 1/4", 7 3/8", 7 1/2", 7 3/8", 7 1/2" XL = 7 5/8", 7 3/4", 8" Only return the topic.
AATCC Testing Information and Hat Sizing