For E3c, E4c, E5c, E500, i3c, and i4c versions. These reusable, silicone sleeves form a tighter seal than flex sleeves while holding the earphones firmly in place. The sleeve tube or flange can be trimmed for customization and greater comfort. Triple-flange sleeves provided as part of the Fit Kit with E4c, i4c, E5c and E500 earphones only.
