Utilizing premium German fleece fabric technology with 90% high-content polyester blend material, combined with thick fleece lining treatment, provides excellent thermal insulation while maintaining lightweight characteristics. The fabric undergoes special processing with good breathability and moisture-wicking function, keeping body dry and comfortable even during intense exercise Professional sports cutting design features round neck style that fits neck curves perfectly, seamless stitching process reduces friction discomfort. Elastic fabric adapts to various movement postures, providing excellent freedom of movement whether for cycling, hiking, running or daily wear Multiple color options meet different aesthetic needs, from classic black, dark gray to fashionable green, light gray and navy blue, there's always one that suits your style. Seven sizes cover from standard to plus sizes, ensuring every user finds the perfect fit Easy care characteristics make this thermal underwear an essential item in your winter wardrobe. Machine washable without deformation, maintains original elasticity and thermal performance, durable and long-lasting. Whether as inner wear or standalone clothing, it delivers outstanding warmth and comfort Suitable for young adults aged 18-40, ideal for winter outdoor sports, daily commuting, and travel activities