These are screen printed with water based ink on Bella Canvas sweatshirts, which are a combination between cotton and polyester and are are considered sponge fleece which is high quality and extremely soft and comfortable. The sweatshirts are unisex,  but are true to size.  When in doubt of your size... Measure one of your sweatshirts you like the fit of and then compare it to the size chart. If you like a looser/oversized fit, I suggest sizing up one size.