Yacheng's one-piece seamless underwear is very good. My husband is wearing it, and the old ones have been thrown into the trash can. One-piece seamless design, super-elastic fit technology at the waist, without any strangeness. Pants are cut freely, without curling and wearing pressure. The crotch is free and unrestrained by drawing lessons from the "space capsule" principle of Pierre Cardin underwear, and at the same time, a good cotton bottom file is added to ensure its good air permeability.