FOE aka Fold over Elastic is a lightweight elastic that has a crease down the middle of it. It often has one shiny side (usually considered the right side) and one matte side (usually considered the wrong side) People use it to make hair ties, headbands. I’ve used it to make tabs on the side of my bags to attach the hardware. You can use it to finish edges in baby clothes and under garments as it’s nice and soft and stretchy. FOE is 100% machine washable and dryer safe.