Proton Mass Hooded Sweatshirt 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. Product Information Not too tight, not too loose. Fabric Thickness: Stay warm with our Hanes Ultimate Cotton Pullover Hood. Constructed with a heavyweight 90/10 cotton/polyester blend. Thick (but not bulky), comfortable, durable and guaranteed. - 10.1 oz. patented PrintPro® fabric in a 90/10 cotton/polyester blend
- Standard fit
- Spandex trim in cuffs and waistband
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