ThisWear Preppy Polka Dots Pi, Pi Day March 14 Math Nerd Long Sleeve T-Shirt 100% cotton (preshrunk), Sport Grey has 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.