NIPIT is the only device to break the habit using the elbow. it does not cover any part of the hand. Kids use their fingers to develop and play but can't comfortably put them in their mouths. Ages 2-7, right or left arm, fully adjustable (see sizing chart). STOP hand from comfortably reaching the mouth.STOP thumb sucking or finger sucking in just 5-21 days! Nipit can stay on when eating or washing hands.