Ive been a metal fabricator who welds and stands on concrete all day for 12 yrs and these are the best boots I have ever bought. I did so much research owned all suitable contenders. I still have them. Though many holes in the tongue from welding, my knees and back felt so much better. They lasted me 2 yrs and the rubber wore out but the insoles are still in great shape. I'm writing this review because after waring timberland pro slip ons for a yr I'm over it. Tims are in great shape but not sturdy, not good on my knees.