Brand: oTZI Shirts

Product Code: TS.596527

Availability: In stock

$ 18.99$ 23.99

Available Options


No, we're not talking about apple pie, and the nerd in your life knows what we're talking about. No matter if you got a brainy dad, grandpa, brother, boyfriend, husband or friend. This shirt will become an essential in his wardrobe. 

It's the best birthday gift for any nerdy dad, friend, grandpa or brother. This fun graphic shirt is the perfect match for any science or math loving guy. And who knows, you might see him wearing it so often, that you'll know the number pi soon by heart.

The Ultimate Pi shirt is available in black, charcoal, navy, heather dark grey, red, and royal blue. The text is always printed in white.

Sizing Chart

Please take a look at the sizing chart below:

Length 28 29 30 31 32 33 34
Width 18 20 22 24 26 28 30

5.0 oz. 100% cotton preshrunk jersey Ash is 98% cotton, 2% polyester; Athletic Heather is 90% cotton, 10% polyester

Fruit of the Loom T-Shirt. Double-needle coverstitched front neck Shoulder-to-shoulder tape Double-needle stitched bottom hem and sleeves High-density fabric.


United States: $5.99 for entire order. International: $15 for entire order. Most orders should arrive within 7-14 days in the US, and 3 weeks or more internationally. 


We will gladly refund or exchange items within 14 days of your order that are new and have never been worn if you're not in love with them. Please read our full Return Policy Here.