Wrangler ultimate khakis, wrinkle-free Review

I bought a couple pair of these a year ago or so at walmart. They haven't been worn very much so they haven't been washed very much. One pair about a month ago just ripped in the most crazy of a place on the leg. No reason for it to do this. I think the chemicals that made them wrinkle free, stain free destroyed the fabric. I can no longer find the same pants for sale. Makes me wonder if they no longer sell these for a reason. I can find wrinkle free ones but not the ones like I bought. At first they were great. Didn't wrinkle, didn't stain but that only lasted 6 months at the most. I am very disappointed in these pants. I wished we could find USA made products but all we, who don't have a lot of money are offered are products that come from other countries.