I first want to say I love Keen as a company. I have bought at least 4 pairs of shoes for work and hiking. I had been wear the Tucson Low Steel Toe for sometime. I started to notice I was having very bad lower back pain after wearing these shoes for a full days work. I bought insoles and the issue got worse. I thought my issue was with my office chair or these work shoes. Wanting to problem solve I decided to wear a different pair of shoes for a full days work. You guessed it, no lower back pain at the end of the day. I should also say I have very flat feet. Again, I love Keen. Your products are great. Your company is also great for being at the head of awesome American made products. It's just this shoe is not for me. Consumer, If you notice back pain from wearing these shoes, stop wearing them and find something else.