This is a GU top. It's about the thickness of a long-sleeved T-shirt, somewhere between a long-sleeved tee and a sweatshirt. There's a mark, possibly from a black pen, on the cuff. I hope to sell this to someone who understands that it's a used item that a child has worn. If you're interested in any other items I have listed, I can include them for free if possible. Please feel free to comment before you buy. I will take measures to protect it from water damage and ship it via anonymous delivery. Thank you.