I know I don't need too much, maybe two inches at the top at the most. I went to the home depot in my town and they didn't know what HIPS even was, I found something close but it was more like paneling and had a weird texture.. I'm also wondering about the bottom of the thighs in the back because they do overlap and it's hard for me to walk even with trimming, do any of you have pictures that would help me figure out the best way for me to do this? It'd be really appreciated.