This is a K-3B top. I've had it for about a year and a half. The print on the back hasn't peeled, but there are some fine cracks. Please check the photos for details. The size is 0/1 (S～M). Please check the size indication in the photos. Please refer to the following product description, which is quoted from the website: This is a super stretch series featuring the highly acclaimed "Ultimate Stretch." It's made of a highly elastic hyper-stretch material using nylon, cotton, and polyurethane. With a sharp design that evokes minimalism, it's functional and versatile, suitable for everyday wear and active scenes. It has a thickness that's just right, between a sweatshirt and a T-shirt. It features pockets with concealed zippers on the sides, providing secure storage for valuables. Material: 43% cotton, 37% nylon, 20% polyurethane - Color: Black - Design: Back print - Collar style: High neck - Brand name: K-3B ZERO Thank you for viewing.