Bombas Women's Marl Calf Sock 4-Pack - Size M - NWT That rare sock that never goes out of style? That’s marl. A flawless fusion of two yarns that creates tantalizing texture. A feast for the eyes that’ll delight your senses, with seriously soft yarns and a cushiony footbed. Extra-Long Staple Cotton Seamless Toe Stay-Up Technology Cushioned Footbed Honeycomb Arch Support Y-Stitched Heel