Proton Mass 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: Warm up in our stylin' Hanes Heavyweight 90/10 cotton/polyester sweatshirt. Thick (but not bulky), for maximum comfort and durability whether you're working out or hanging out. - 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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