I've had to use the electric stove burner with pliers to heat these enough to spread them then dunk them in cold water so they are spread enough to where they are comfortable for my big ears. Another thing is the little clasp that's attached to the blue tooth breaks off if you try to remove it.
Got these to replace the original (I broke) that came with my bluetooth ear piece. Ordered the wrong size, but exchanged for the correct one. Love them! Fit better than the original and easier to put on.