Pi Day I Raspberry Pi Pie Classy Maker hobbyist Computer Programming Funny Food Lover Math Teacher Science Student Gift This t-shirt is everything you've dreamed of and more. It feels soft and lightweight, with the right amount of stretch. It's comfortable and flattering for both men and women. 100% combed and ring-spun cotton (Heather colors contain polyester) Ash color is 99% combed and ring-spun cotton, 1% polyester Heather colors are 52% combed and ring-spun cotton, 48% polyester Athletic and Black Heather are 90% combed and ring-spun cotton, 10% polyester Heather Prism colors are 99% combed and ring-spun cotton, 1% polyester Fabric weight: 4.2 oz (142 g/m2) Pre-shrunk fabric Side-seamed construction Shoulder-to-shoulder taping