Pi 3.14 Spiral, Pi Day March 14 2016 Math Nerd Geek Long Sleeve T-Shirt 100% cotton (preshrunk). Ash is 99%/1% cotton/poly, Sport Grey is 90%/10% cotton/poly with double-needle neck and hem. For great comfort, it has taped neck and shoulders, rib knit cuffs. The design is printed with new age printing technology, direct-to-garment. It is printed with a water-soluble and eco-friendly ink. It is cured with a heat treatment process to ensure the color-fastness and lasting durability of the design. Authentic ThisWear  design printed with pride in the United States. This is not an unauthorized replica/counterfeit item. This is an original inspired design and does not infringe on any rights holders rights. Words used in the title/search terms are not intended to imply they are licensed by any rights holders.