This is going to sound like a stupid question, but I need to know. Not really, but I want to know. I just got a hoodie that I bought for my granddaughter's birthday. It's from her school and cost me $49 w/shipping. Ouch.

Anyhow, the image on the shirt is a thick gray and I don't know if it was screen printed or that plastisol stuff. I'm not really sure what plastisol is anyhow.
The image has a very heavy hand and actually feels like vinyl on the shirt. You can't see the shirts material through it either. There is no shadow around the letters.
Come to think of it maybe it's vinyl. I don't understand the vinyl or plastisol part of this business at all. Can someone explain it to me? I do heat transfer with chromablast and sublimation dyes and with regular heat transfers.