Here's how to determine which size to buy:
Men's Apparel Sizing Information: Small: Chest = 37-39", Waist = 38-31", Neck = 14-14.5", Arm = 32-33"
Medium: Chest = 40-42", Waist = 32-35", Neck = 15-15.5", Arm = 33-34"
Large: Chest = 43-45", Waist = 36-39", Neck = 16-16.5", Arm = 34-35"
XLarge: Chest = 46-48", Waist = 40-43", Neck = 17-17.5", Arm = 35-36" XXLarge: Chest = 49-51", Waist = 44-46", Neck = 18-18.5", Arm = 36-37"
XXXLarge: Chest = 52-54", Waist = 47-49", Neck = 18-19", Arm = 36-37"
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