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Einstein Pythagoras Long Sleeve T-Shirt for the math or physics nerd - "Einstein meets Pythagoras." E=m(a2+b2). $21.95 Size:  Size Chart Small Medium Large X-Large 2X-Large (+$3.00) 3X-Large (+$3.00) Color: White Ash Grey Qty:    AVAILABILITY: Product Number: 10684784 Product Information Fit: Standard Not too tight, not too loose. Fabric Thickness: The most comfortable t-shirt ever! Our 100% cotton, Hanes Beefy-T is preshrunk, durable and guaranteed. 6.1 oz. 100% luxuriously soft ring spun cotton Standard fit Ribbed sleeve cuffs