Bought these last year when they did a hospital visit. I am a Nurse and a long time Runner with some back/knee issues; wear them at work and for my runs. I had both professionally fitted ones, where I paid $400 and other brands expensive and did not last. Loves these! These have awesome support, arch, and sturdy. Just upgraded to the most recent version; ran in them for my Marathon; amazingly my back did not spasm the following day. Gave them to my youngest Son, who has flat footed. Took the cheap manufacture one out and put Arch Mobility in; "Mom, I feel like I am bouncing!" A Smile on his face, priceless. My whole family is wearing them now. Protalus, THANK YOU for making a DIFFERENCE!