Chest: S 35-37, M 38-40, L 41-43, XL 44-46, 2X 47-49, 3X 50-53, 4X 54-57. Neck: S 15-15.5, M 15.5-16, L 16-16.5, XL 16.5-17, 2X 17-17.5, 3X 17.5-18, 4X 18-18.5.