The piece is made with a 100% Cotton fabric and a 100% Polyester lining. The outer fabric is a high-density cotton with a matte finish and a slight waxed feel, offering water-resistant function for everyday wear in autumn and winter. The lining uses a high-quality dense woven check fabric in a retro color scheme, with the same contrast check fabric at the cuffs that can be turned up as a classic styling detail. The piece has a relaxed, loose fit with raglan sleeves, a corduroy-trimmed collar, and a clean vintage aesthetic suited to casual daily wear and commuting. The cotton fabric is moderate in thickness, and the filling is 3M Thinsulate KL type high-loft warm material, with a CLO value of 1.2, a thickness of 0.8CM, and a fill weight of about 40G. This filling has a fiber fineness of only 1/25 of a hair, forming dense air chambers that lock in heat efficiently. It absorbs less than 1% of its weight in moisture, retaining most of its insulation even in damp conditions, and after 150 simulated washes it still maintains 92% loft. It can be machine washed normally, returns well after washing, does not shrink significantly, and does not noticeably affect warmth.