Size SM: Height/Chest Circumference (Manufacturer's listed size): 5 ft 3.8 inches - 5 ft 6.1 inches (162 - 168 cm) / 33.5 - 35.8 inches (85 - 91 cm).
Size MD: Height/Chest Circumference (Manufacturer's listed size): 5 ft 5.7 inches - 5 ft 8.1 inches (167 - 173 cm) / 35.0 - 37.4 inches (89 - 95 cm).
Size LG: Height/Chest Circumference (Manufacturer's listed size): 5 ft 7.7 inches - 5 ft 10.1 inches (172 - 178 cm) / 36.6 - 39.0 inches (93 - 99 cm).
Size XL: Height/Chest Circumference (Manufacturer's listed size): 5 ft 9.7 inches - 6 ft (177 - 183 cm) / 38.2 - 40.6 inches (97 - 103 cm).
Size XXL: Height/Chest Circumference (Manufacturer's listed size): 5 ft 11.7 inches - 6 ft 2.0 inches (182 - 188 cm), 39.8 - 42.1 inches (101 - 107 cm).
Size 3XL: Height/Chest Circumference (Manufacturer's listed size): 6 ft 1.6 inches - 6 ft 4.0 inches (187 - 193 cm), 41.3 - 44.5 inches (105 - 113 cm).
Size 4XL: Height/Chest Circumference (Manufacturer's listed size): 6 ft 3.6 inches - 6 ft 6.0 inches (192 - 198 cm), 43.7 - 46.9 inches (111 - 119 cm).