Uniqlo Heattech Set of 2 M & S Azuki (red bean) & Navy Azuki-colored Heattech Size: M Bust: 80-86 Navy Heattech Size: S Bust: 77-83 Material (both items) Polyester: 38% Acrylic: 35% Rayon: 18% Polyurethane: 9% Both items are thin, warm, and have a comfortable feel.