The mid-collar protection style, warmth and yang velvet, soft and skin-friendly, the new blended fine fiber gives the fabric a new tactile experience, effectively locks the human body heat, strengthens the warmth retention performance; moisture locks temperature, heat preservation while reducing sweat accumulation; light + Warm zero pressure needs to be integrated with the skin. The weight of 0.458KG is equivalent to about 8 eggs. The heat preservation is no longer bloated. The close-fitting 3D underwear and 360° three-dimensional slimming technology make the underwear naturally fit the body; High waist to keep warm, side opening, more convenient,Elastic waistband, comfortable and non-squeezing; tapered trouser legs, prevent from running up, it is more convenient to plug socks to keep warm;