Elon's been on a tear lately about Pysops on Twitter. This is that shirt from his meme. 

The unisex soft-style t-shirt puts a new spin on casual comfort. Made from very soft materials, this tee is 100% cotton for solid colors. Heather colors and sports grey include polyester. The shoulders have twill tape for improved durability. There are no side seams. The collar is made with ribbed knitting to prevent curling damage.

.: 100% ring-spun cotton (fiber content may vary for different colors)
.: Light fabric (4.5 oz/yd² (153 g/m²))
.: Eurofit
.: Tear-away label
.: Runs true to size