Printed with eco-friendly ink. 
Shirts are from American Apparel:

Enjoy everything you love about the fit, feel and durability of a vintage T-shirt, in a brand new version.

Tri-Blend (50% Polyester / 25% Cotton / 25% Rayon) construction. Polyester retains shape and elasticity; Cotton lends both comfort and durability; addition of Rayon makes for a unique texture and drapes against the body for a slimming look. Durable rib neckband.