This is a set of four items from Uniqlo for children: two Heattech shirts and two long-sleeved undershirts. My child didn't like the long-sleeved undershirts and didn't wear them much, so they've been stored in the closet. They've been washed a few times, so there's some pilling, but the fabric is still in good condition and should be wearable. Please refrain from purchasing if you are concerned about the details, as they have been stored at home. The following is an AI-generated product description: Black long-sleeved HEATTECH shirt, size 100, an item with excellent heat retention. - Brand: UNIQLO - Model Name: HEATTECH - Size: 100 - Material: 54% polyester, 38% cotton, 8% polyurethane - Color: Black Thank you for viewing. Size: 100cm