Warmest in the Series: EXTRA is one of the warmest models in the Shin-Hotto Suru Innerwear series. Blanket-like Warmth: Featuring a 3-layer quilted fabric with heat-generating yarn on the skin side, it's as fluffy and light as a blanket, providing amazing warmth. High-Function Material: In addition to moisture absorption, heat generation, contact warmth, and heat retention, it also has antibacterial and deodorizing properties. Material Composition (for size L): 65% Acrylic, 20% Rayon, 10% Wool, 5% Nylon. Size: L Color: Black系 (Black-based) Stains, tears, odors, etc.: None