This high-performance cold-weather innerwear (COSMOHEAT) utilizes aerogel, known as an insulation material adopted by NASA, and graphene, which is said to have far-infrared effects, providing high heat retention and stretchability despite its thinness. (※ Descriptions and functional explanations are based on information released by the manufacturer) Type/Color: "Long Sleeve - Black", Size: "L", New and unused condition. 【Important】Pants are not included. This product is only the top innerwear. 【Product Features】(※ Descriptions and functional explanations are based on information released by the manufacturer) Brand: Duerfusa Material Composition: Heat-generating graphene print x insulating aerogel material Care Instructions: Machine washable Price at purchase: 3,980 yen ■ Aerogel, an insulation material said to have been used by NASA, x Far-infrared graphene x High elasticity This cold-weather innerwear combines "aerogel," an insulation material said to have been used in the space field, with far-infrared graphene print and highly elastic brushed-back fabric. The aerogel sheet on the shoulders blocks heat escape from easily chilled joints, achieving a heat retention rate of 40.5% and a Clo value of 0.423. The graphene print on the upper back reflects and stores infrared rays from body heat. The fabric stretches approximately 70%, providing warmth that is easy to move in for work, outdoor activities, commuting, and sports. ■ "Aerogel," an insulation material said to have been used in the space field Aerogel is known as a material with high insulation properties and is said to have higher heat retention efficiency than general materials. ■ Far-infrared graphene print The graphene print on the upper back reflects and stores body heat, preventing a drop in temperature on the back. Combined with aerogel, it achieves a double structure that prevents cold and retains heat. It maintains warmth even during long hours of outdoor work or commuting. ■ Brushed-back 70% stretch x Deodorizing/Quick-drying and moisture-wicking The fabric is highly elastic and easy to move in, and the brushed-back stretch mesh on the sides enhances breathability. The deodorizing tape on the sides cuts over 99% of ammonia, up to 99% of acetic acid, and up to 98% of isovaleric acid. The quick-drying and moisture-wicking treatment prevents sweat chills and stuffiness, and the hem is +2cm longer for a cold-weather specification that prevents the back from being exposed. Stored indoors in a smoke-free environment. Shipped within 24 hours via Mercari's anonymous Yu-Packet Post. 【★Important★】 The item will be shipped by removing the clothes from the outer box and placing them in a transparent plastic bag, then in a bubble wrap brown envelope.