I have plantar fasciitis and my feet hurt so bad on a daily basis. When I would get out of bed in the morning my knees would buckle because my feet hurt so bad and I had problems sleeping because my back hurt to the point I was going to invest into a new mattress...I saw the advertisement for Protalus insoles on Facebook and thought this is another gimmick!! But it has a 90-day return policy so I figured I would have nothing to lose. After 3 days my feet have almost completely stopped hurting, I’ve got up the last two mornings with no back pain!! I’m a believer in these insoles to the point I’m going to purchase another pair.