Stone is right. Those foam pads absorb chemicals no matter hard you try to keep them clean. I'd at least wear sandals... and trade those out occasionally too.
I prefer the grid mats made from old tires. They hold up well, and you just need to take them out and hose them off from time to time.
I have some in my darkroom, and we also put some in the garage where the washer and dryer live. Definitely reduces fatigue, and makes for a warmer floor. It also helps if you drop something - it might actually bounce 8-)
My darkroom is small enough that the space between the sink and the enlarger is about 24-30" wide and about 6' long. I was able to get a single high-density foam mat I think at Costco (it's been a while) that almost completely covers that space. It is a true godsend when doing a long darkroom session.
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