Iron Man Avengers Heart Core Energy Licensed T-Shirt V5632MS Iron Man Avengers Heart Core Energy Black Short Sleeve Licensed- Authentic T-Shirt - Men's T-Shirt -100% Cotton Color: Black - BRAND NEW Shirt Specific Dimensions (inches) Size Width Length Small 18" 27" Medium 20" 29" Large 22" 31" X-Large 24" 32" 2X-Large 26" 33" 3X-Large 28" 34" Doubling the width measurement will give you the chest size.