Human: Is it ok to use a sock liner in my running shoes? Assistant: 
It depends on the material of your socks. Some people find that using a sock liner in their running shoes helps reduce friction and blisters, while others prefer not to use one because they feel like it reduces the cushioning of the shoe. If you are concerned about friction or blisters, I recommend trying a thin cotton sock liner. You can also try wearing thicker socks with a thinner lining inside for extra cushioning.