Pros: Super comfortable, easy to get in and out of boots, last a long time
Cons: Your toes can get cold.
My buddy kept pressuring me to get some and told me how big of a difference they will make. I finally bought some this season, rendering my new boots useless. I had to go down a shell size and get a much narrower boot. I have very wide feet but with these I can get into a narrower boot. The ZipFit liners also how your ankle down better than any other liner. I wore extremely thin socks and the liner sucks onto your foot making it immobile. These are really fantastic liners, I recommended them to everybody.