Fabric Composition:Made with super soft and lightweight smooth omni-dry fabrics (75% Nylon and 25% Spandex) .In addition,the crotch is made of 100% COTTON. Seamless Underwear: NO real elastic,low waist, just like the second layer of skin to meet the picky requirements of the butt for comfort. you won't get foreign body sensation and it can reduce the friction during exercise, you can easily control all kinds of material fabric dresses or semi-nude dresses,sweatpants or tight-fitting professional wear, highlighting the human body beautiful lines. Bikini Cut:Laser cut, seamless wavy sides for a smooth look under clothes, comes up to sit just below your belly button.No slipping and never roll down,makes it a better fit. Trusted Comfort Fit: invisible cotton underwears are skin-friendly,no fading,no fluorescer,moisture-wicking,super thin and smooth under any clothes.Giving you maximum comfort and protection.