This is a full-zip hoodie from GU (ジーユー). It has a classic, simple design and is an XL size, allowing for a trendy oversized fit. Made of thick sweatshirt material, the inside is likely brushed fleece (or loopback), making it warm to wear in the coming season. It's a highly versatile item that can be worn over a T-shirt or as an inner layer under a coat or jacket.