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Two pi r Men's Sleeveless Tee 2pi r better than 1. A reference to the circumference formula. For the math nerd or teacher. Great for PI day, March 14th. $17.95 Size:  Size Chart Medium Large X-Large Qty:    AVAILABILITY: Product Number: 28309431 Product Information Fit: Standard Not too tight, not too loose. Fabric Thickness: Beat the summer heat or workout in comfort. Our 100% cotton sleeveless tee from Anvil is what to wear when you want to go casually cool. 6.1 oz. 100% cotton Standard fit