Those with more selective ear types can have a better audio experience with this soapstone Alternate Sizing Kit for QuietComfort Earbuds II from Bose. The kit includes a pair of silicone eartips and silicone stability bands in sizes extra-small and extra-large. They are ideal for those who find that the QuietComfort's included small, medium, or large eartips are not quite a perfect fit. With a more appropriate size, you can fully benefit from a comfortable and noise isolating seal from the eartips, and the secure fit provided by the stability bands.