[QUOTE=sam1000000;2280474]How do liner socks solve the sliding issue? Aren't they really thin?[/QUOTE
Liner socks are meant to be thin, and on top of them you wear your hiking socks. The idea is to reduce friction. also, feet will swell, that is why you want your hiking shoes to be a size or so bigger. I learned it the hard way, loosing a big toenail.
In some cases to get the fit for my wide feet I have to go one size up and then I need to glue a tapered foam pad the the inside of the tongue. This helps keep my foot back in the heel space. Its not ideal but in combinstion with my inserts it helps reduce the sliding. I cut them myself but year ago I bought a commercial version from a Red Wing dealer for some work boots.