The World’s Most Comfy Undies Want to slip into a pair of insanely comfortable underwear? Piado is here for you. The independent fashion brand specializes in briefs and trunks made of super-slinky bamboo rayon and a touch of lycra for added stretchability. Available in a variety of punchy colors and super-affordable to boot, these undergarments will quickly graduate to the very top of your underwear drawer.