[FLYSKY] Men's T-shirt, Warm Mock Neck T-shirt, Warm Innerwear, Thermal Underwear, Solid Color, Simple, Round Neck, Long Sleeve, Thick Color: Navy系 (Navy-based) Pattern/Design: Solid Stains, tears, odors, etc.: None Thank you for viewing. This item is unopened, but it doesn't fit me, so I'm offering it to someone who needs it. Perfect as thermal underwear for this season. 【Size】 L = Japanese M (Height 160-170cm, Weight 55-65kg) *Although it's labeled as L size, it seems to be about the same as a Japanese M size. Please refer to the size chart in the images. 【Material Composition (Outer Fabric)】 95% Polyester, 5% Synthetic Fiber (Spandex) 【Unique Design】 The mock neck design that wraps around the neck provides a comfortable fit, keeping your neck warm while giving a stylish impression. The perfect fit that doesn't cling to the body's lines, it combines ease of movement and comfort, perfect for casual styles. Excellent stretch, it maintains a good fit without hindering body movement. 【Excellent Heat Retention】The soft micro-brushed finish on both the inside and outside allows you to feel the warmth from the moment it touches your skin. It stores heat well in the body, and this material provides comfort and warmth perfect for the autumn and winter seasons, allowing you to wear it with confidence even on cold days and nights. 【Versatile】 Mock neck, light yet warm to wear. Slim style, so it can be worn with a suit. Of course, it can be worn as loungewear, and it also works well as an inner layer for outerwear (hoodies, outerwear, jackets, down jackets) in autumn and winter.