Usually adult S/M are too big and "one size fits all" caps NEVER fit my tiny, 6 7/8 head. Plus, I'm very picky about my hats so when ordering ballcaps, I'm always hesitant and just try to make the youth size fit. Sometimes, quality and function are sacrificed for youth. This Velcro adjustable Sitka Youth cap fits PERFECTLY, breathes well, has a quality headband, is durable, and looks good, meeting my picky standards! Will now be the only ballcap I ever wear hunting!!!