This pack of three pairs of Triple-Flange Sleeves from Shure is designed for use with select Shure earphones. The comfortable silicone sleeves are washable and reusable. The triple-flange construction forms a tighter seal than Shure's flex sleeves, helping to block out more ambient noise. It allows provides more contact with your ear canal, helping your earphones stay in place during physical activity. If desired, the tube or flange of the sleeve can be trimmed for greater comfort.