In an other thread I read a comment from Shroomgirl about a client of hers having a concrete floor in their party barn (I need to get a party barn I think) and it being tough on her knees and lower back. About 10 years ago I went from wearing runners in the kitchen to Birkenstocks and could not believe the difference on my back and knees. I had to bid my Birks fair well :cry: (now the most expensive slippers I have ever owned!) as my current employers mandated steel toes so I have gone to SIKA steel toe clogs with flex sole (wood is also available). There good, but nothing beets my Birks! Just wondering what every one else has at the end of the checkered pants?