hey if you are interested, after some research, easy to make yourself. just take some old thick baby socks, cut the toes out of them, pull them up over their knees, and presto!
We have tiles in most of the house and DS crawls like a madman over them and often has little bruises on his knees/legs from all his climbing, but it hasn't slowed him yet.
I too think its a ploy, and as Beautitude said - Their little knees are made for crawling!
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