Definition: Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Input: I bought these hoping I could make my Bluetooth headset fit better but these things made it impossible to wear. The design might be ergonomic in theory but I could not stand having these in my ear. They seem to be made of a very thick silicone that has a slightly slippery feel to them. I was really disappointed with these. Stay away if you have small ear canals.
Output:
Negative