Perle Cotton. I would use embroidery floss but my friend swipes it to finish off fleece throws with or my daughter to make friendship bracelets. They don't seem to like the perle cotton unless my friend is making wash cloths--then she prefers the white or natural color & just sniffs at my pastels and variegateds--LOL. I don't like plain white anything so I never buy that, even in embroidery floss.