This 'heart glyph' tank is made of 100% cotton.
The reason why it is named 'heart glyph' is because the drawing came through after I had a unique experience of beings that came to work on my heart. They came through as tiny mechanics, operating on me in mysterious ways. Maybe some of their medicine gets to translate itself through this piece as you wear it close to your chest ;)
The grey and black version is on sale because there was a mix-up with the print color. It's still a great shirt, although I had a different color combination in mind....
The blue one is wonderful, yet in the new rendition I made the print color more contrasting.