Please visit www.yelp.com and type in "doctor comfort"
I explain in detail how my feet were injured and rubbed raw as a result of removing the doctor comfort insole and putting in its place a store bought gel insole. Based on the reply I received from Doctor Comfort, you can't do this decause it exposes all the stitches inside the shoe, which totally rub the sides of your feet raw and take weeks to heal. This shoe requires there special insole, and no other purchased insole will cover the hideous stitches on the entire inside of the shoe. Worst designed shoe on the market and yes it is MADE IN CHINA, and my cost $175 in the USA.