Drawstring mask elastic sew in for an adjustable fit. Just slide the bead to easily adjust the length so that your face masks will fit anyone. The elastic is very soft (90% nylon, 10% spandex) and extremely comfortable on the ears. The bead is 100% PVC. The loops is approximately 8" (4" folded in half) and it stretches up to 12". Machine wash and dry. Do not iron.