Marvel Comics Amazing Spider Man Invested-M Official Licensed T-Shirt (AJSHEARS) Marvel Comics Amazing SpiderMan Invested-M Red Color Short Sleeve Licensed- Authentic T-Shirt - Men's T-Shirt -100% Cotton Color: Red - 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.