Please note that our Impact Vests have been designed to fit snugly for optimal safety and performance. We recommend that customers size up from their usual T-shirt size to ensure a comfortable fit. To determine the best size for you, please refer to the chart below: SIZE CHEST CM BODY LENGTH CM WEIGHT KG MIN. BUOYANCY N XS 82 62 40-60 45 S 92 64 40-60 45 M 100 66 60-70 60 L 104 68 +70 60 XL 112 70 +70 60 2XL 118 72 +70 60 3XL 124 72 +70 60 CHESTMeasure under arms around the fullest part of the chest. Be sure to keep tape level across back and comfortably loose. BODY LENGTHMeasure from top of shoulders to the groin. WEIGHTPlease weigh yourself to make sure your weight aligns with the size you are choosing. MIN. BUOYANCYIs the buoyancy level of the impact vest you choose. *Note this size chart is only a guide.