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Proton Mass Fitted T-Shirt Does This Proton Make My Mass Look Big?: Quite possibly the geekiest joke ever. You're guaranteed to get groans (and maybe old fruit thrown at you) when you wear this shirt. $20.99 convert currency Size:  Size Chart Small Medium Large X-Large 2X-Large (+$3.00) Qty:    AVAILABILITY: Product Number: 186552870 Tell a friend about this product! Product Information Fit: Fitted Smaller cut, designed to fit tightly. Size up for a looser fit. Fabric Thickness: For stylish weekend comfort anytime, guys will want to live in our Fitted T. Made of ultra-fine, combed ring-spun cotton, that gets softer with each washing. Lightweight for summer comfort or winter layering. Grab attention with this vintage fit that loves to hug skin. (Size up for a looser fit). 4.8 oz. Ultra-fine combed ring spun cotton Vintage fit (size up for a looser fit) Made in the U.S.A.