I'm not entirely sure, but it seems to be an early version of Uniqlo's Heattech. My wife at my parents' house back then said it was too small for her. I usually wear between M and L, but Uniqlo tends to feel small on me. This one was tight around the waist, and I didn't like the snug fit, so I only wore it a couple of times and then stored it. Looking at it now, it seems warm with the fleece lining. I think it would be suitable for someone who wears a size S. ⚠️ Please note that the elastic may not be guaranteed due to its age. I still think it's a shame to throw it away, so would anyone like to wear it? ⚠️ Due to shipping costs, I plan to send it via Yu-Packet Post Mini. Therefore, it will be folded and compressed. Please refrain from purchasing if you are sensitive or concerned about minor details. HEATTECH EXTRA WARM M size black spats. - Brand: HEATTECH - Model Name: EXTRA WARM - Size: M - Color: Black - Material: 62% Polyester, 33% Rayon, 5% Polyurethane Thank you for viewing. Color: Black系 (Black-based)