Small Kids - 24/26" Chest - Age 5-6 yrs
Medium Kids - 26/28" Chest - Age 7-8 yrs
Large Kids - 28/30" Chest - Age 9-11 yrs
Small Adult - 34/36" Chest
Medium Adult - 36/38" Chest
Large Adult - 42/44" Chest
XLarge Adult - 46/48" Chest
XXLarge Adult - 50/52" Chest
Size up for oversized look
