I've been using chota boots for a number of years. Not sure what the first one's were called. Then trekkers and now on my second pair of Caney Forks.  Good boots, but I learned twice now that if they are even coming apart a little, replace them. Both times I thought I could get one more trip out of them... both times they really fell apart. Dental floss is good thread I learned in this. For me the thread doesn't hold up. I don't know if it's a China thing. Cheap steel/ cheap thread... haha. But all models of chota's I found I had to remove and replace the insert or insole whatever you call them. For me they always worked there way from below your feet. Replace with a good one, I use superfeet as someone else mentioned they did too. I wear one pair of smart wool with a liner or pull insole and wear the chota neoprene sock that goes to your knee. I'm really hard on footwear and I don't know why.