HEATTECH EXTRA WARM leggings for kids, size 110. Although the label is the same, the thickness is completely different. One pair is the extra warm level, which I used as an inner layer for skiing, and the other pair is a regular HEATTECH legging. I think you can use them differently depending on the temperature. - Brand: UNIQLO - Model name: EXTRA WARM - Size: 110 - Material: 60% polyester, 30% rayon, 10% polyurethane Thank you for looking.